What explains how the parents in a family both have the same eye color, but some of their children have a different eye color? Assume for this example that eye color is determined by a single gene.
Responses
One parent is homozygous dominant, and the other homozygous recessive for a gene that controls eye color allowing some of the children to express a different trait.
One parent is homozygous dominant, and the other homozygous recessive for a gene that controls eye color allowing some of the children to express a different trait.
The parents are both homozygous dominant for a gene that controls eye color allowing some of the children to get two recessive alleles.
The parents are both homozygous dominant for a gene that controls eye color allowing some of the children to get two recessive alleles.
The parents are both heterozygous for a gene that controls eye color allowing some of the children to get two recessive alleles.
The parents are both heterozygous for a gene that controls eye color allowing some of the children to get two recessive alleles.
One parent is homozygous dominant, and the other heterozygous for a gene that controls eye color allowing some of the children to express a different trait.
25 answers
One parent is homozygous dominant, and the other heterozygous for a gene that controls eye color allowing some of the children to express a different trait. In this case, the homozygous dominant parent passes on the dominant allele for eye color to all their children, while the heterozygous parent has a 50% chance of passing on the dominant allele and a 50% chance of passing on the recessive allele. This results in some of the children inheriting two dominant alleles and having the same eye color as their parents, while others inherit one dominant and one recessive allele, leading to a different eye color.
Which of the following disorders describes cystic fibrosis?
Responses
mitochondrially inherited
mitochondrially inherited
autosomal dominant
autosomal dominant
autosomal recessive
autosomal recessive
sex linked
sex linked
Responses
mitochondrially inherited
mitochondrially inherited
autosomal dominant
autosomal dominant
autosomal recessive
autosomal recessive
sex linked
sex linked
The correct answer is autosomal recessive. Cystic fibrosis is an autosomal recessive disorder, meaning that it is caused by inheriting two recessive alleles for the gene associated with the disorder.
Scientists are studying a genetic disorder. They discover that when both parents are carriers, and do not express the disorder themselves, their children have a 25% chance of developing the disorder. If only one parent is a carrier, none of the children express the disorder. What type of disorder are they most likely studying?
Responses
autosomal dominant
autosomal dominant
mitochondrially inherited
mitochondrially inherited
sex linked
sex linked
autosomal recessive
autosomal recessive
Responses
autosomal dominant
autosomal dominant
mitochondrially inherited
mitochondrially inherited
sex linked
sex linked
autosomal recessive
autosomal recessive
The disorder that is most likely being studied in this scenario is autosomal recessive. Autosomal recessive disorders typically require the inheritance of two copies of the recessive allele, one from each parent, in order for the disorder to be expressed. When both parents are carriers (heterozygous), each child has a 25% chance of receiving two copies of the recessive allele and developing the disorder. If only one parent is a carrier, none of the children will have a chance of receiving two copies of the recessive allele and therefore will not express the disorder.
What molecule forms a double helix structure composed of two complimentary strands of nucleotides?
The molecule that forms a double helix structure composed of two complimentary strands of nucleotides is deoxyribonucleic acid (DNA).
An ecosystem contains more individuals of a certain species than it can support. Which of the following describes if natural selection will occur and why?
Responses
Natural selection will not occur because there is no competition
Natural selection will not occur because there is no competition
Natural selection will not occur because there is no mutation
Natural selection will not occur because there is no mutation
Natural selection will occur because there is competition
Natural selection will occur because there is competition
Natural selection will occur because there is lowered fitness.
Responses
Natural selection will not occur because there is no competition
Natural selection will not occur because there is no competition
Natural selection will not occur because there is no mutation
Natural selection will not occur because there is no mutation
Natural selection will occur because there is competition
Natural selection will occur because there is competition
Natural selection will occur because there is lowered fitness.
The correct answer is "Natural selection will occur because there is competition." When an ecosystem contains more individuals of a certain species than it can support, it results in competition for limited resources such as food, water, and space. This competition will lead to differential survival and reproduction, where individuals with advantageous traits that allow them to access and utilize resources more effectively will have higher fitness and a better chance of passing on their genes to the next generation. As a result, natural selection will occur, favoring traits that improve survival and reproductive success in the given environment.
A piece of DNA from a gene found in a deer is compared to the same gene in four other species of mammals.
Comparison
Total Nucleotides Compared
Number of Identical Nucleotides
Deer and chimpanzee 300 297
Deer and rabbit 300 295
Deer and kangaroo 300 278
Deer and anteater 300 290
Based on this analysis, which animal is the closest relative of the deer?
Responses
chimpanzee
chimpanzee
kangaroo
kangaroo
anteater
anteater
deer
Comparison
Total Nucleotides Compared
Number of Identical Nucleotides
Deer and chimpanzee 300 297
Deer and rabbit 300 295
Deer and kangaroo 300 278
Deer and anteater 300 290
Based on this analysis, which animal is the closest relative of the deer?
Responses
chimpanzee
chimpanzee
kangaroo
kangaroo
anteater
anteater
deer
Based on the provided information, the animal that is the closest relative of the deer is the chimpanzee. The comparison between the DNA of the deer and the chimpanzee shows the highest number of identical nucleotides, with 297 out of 300.
The graph shows the natural variation in size of a population of fish, with some small, some medium, and some large types of fish.
a bell-shaped curve with a central hump shown on an axis. The X axis is labeled "size". The Y axis is labeled "number of individuals".
© 2020 StrongMind
A new predator is introduced to an aquatic ecosystem. In a population of fish that live there, very small fish are more easily able to hide from the predators, and very large fish cannot be easily eaten by predators. What type of natural selection is acting on the population, and what will be the expected result?
Responses
Stabilizing selection: Since both extremes are selected against, the fish population will remain about the same.
Stabilizing selection: Since both extremes are selected against, the fish population will remain about the same.
Stabilizing selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Stabilizing selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Disruptive selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Disruptive selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Disruptive selection: Since both extremes are selected against, the fish population will remain about the same.
a bell-shaped curve with a central hump shown on an axis. The X axis is labeled "size". The Y axis is labeled "number of individuals".
© 2020 StrongMind
A new predator is introduced to an aquatic ecosystem. In a population of fish that live there, very small fish are more easily able to hide from the predators, and very large fish cannot be easily eaten by predators. What type of natural selection is acting on the population, and what will be the expected result?
Responses
Stabilizing selection: Since both extremes are selected against, the fish population will remain about the same.
Stabilizing selection: Since both extremes are selected against, the fish population will remain about the same.
Stabilizing selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Stabilizing selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Disruptive selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Disruptive selection: Over time the fish population will change. Medium-sized fish will become rare, small and large fish will be common.
Disruptive selection: Since both extremes are selected against, the fish population will remain about the same.
The correct answer is: Stabilizing selection: Since both extremes are selected against, the fish population will remain about the same.
In this case, the introduction of the new predator creates a selective pressure that favors individuals at both ends of the size spectrum (very small and very large). As a result, medium-sized fish, which are more vulnerable to predation, will face a disadvantage and become less common in the population. This process is an example of stabilizing selection, where the selective pressure narrows the range of variation by favoring individuals closer to the average (in this case, very small and very large fish). Overall, the fish population will remain relatively stable, with no significant change in size distribution.
In this case, the introduction of the new predator creates a selective pressure that favors individuals at both ends of the size spectrum (very small and very large). As a result, medium-sized fish, which are more vulnerable to predation, will face a disadvantage and become less common in the population. This process is an example of stabilizing selection, where the selective pressure narrows the range of variation by favoring individuals closer to the average (in this case, very small and very large fish). Overall, the fish population will remain relatively stable, with no significant change in size distribution.
A population of plants growing in a field is examined over a period of years. The plants have either white or yellow flowers.
year Percent white Percent yellow
1941 12% 88%
1954 20% 80%
1957 23% 77%
1960 30% 70%
1965 41% 59%
1971 60% 40%
What best explains the observations?
Responses
Yellow flowers increase the plant's fitness, so the population is under disruptive selection.
Yellow flowers increase the plant's fitness, so the population is under disruptive selection.
White flowers increase the plant's fitness, so the population is under disruptive selection.
White flowers increase the plant's fitness, so the population is under disruptive selection.
Yellow flowers increase the plant's fitness, so the population is under directional selection.
Yellow flowers increase the plant's fitness, so the population is under directional selection.
White flowers increase the plant's fitness, so the population is under directional selection.
White flowers increase the plant's fitness, so the population is under directional selection
year Percent white Percent yellow
1941 12% 88%
1954 20% 80%
1957 23% 77%
1960 30% 70%
1965 41% 59%
1971 60% 40%
What best explains the observations?
Responses
Yellow flowers increase the plant's fitness, so the population is under disruptive selection.
Yellow flowers increase the plant's fitness, so the population is under disruptive selection.
White flowers increase the plant's fitness, so the population is under disruptive selection.
White flowers increase the plant's fitness, so the population is under disruptive selection.
Yellow flowers increase the plant's fitness, so the population is under directional selection.
Yellow flowers increase the plant's fitness, so the population is under directional selection.
White flowers increase the plant's fitness, so the population is under directional selection.
White flowers increase the plant's fitness, so the population is under directional selection
Based on the provided information, the best explanation for the observations is that yellow flowers increase the plant's fitness, so the population is under directional selection.
Over the years, the percentage of white flowers in the population decreases gradually, while the percentage of yellow flowers increases. This pattern suggests that individuals with yellow flowers have a higher fitness, meaning they are better adapted to their environment and have greater reproductive success compared to individuals with white flowers. As a result, there is a directional shift in the population towards yellow flowers as they become more prevalent. This is an example of directional selection, where selection pressures favor one extreme of a trait distribution over the other.
Over the years, the percentage of white flowers in the population decreases gradually, while the percentage of yellow flowers increases. This pattern suggests that individuals with yellow flowers have a higher fitness, meaning they are better adapted to their environment and have greater reproductive success compared to individuals with white flowers. As a result, there is a directional shift in the population towards yellow flowers as they become more prevalent. This is an example of directional selection, where selection pressures favor one extreme of a trait distribution over the other.
Which of the following is true of the first trophic level of all ecosystems?
Responses
It contains carnivores
It contains carnivores
It contains producers
It contains producers
It contains herbivores
It contains herbivores
It contains apex predators
Responses
It contains carnivores
It contains carnivores
It contains producers
It contains producers
It contains herbivores
It contains herbivores
It contains apex predators
The correct answer is: It contains producers.
The first trophic level of all ecosystems consists of producers, also known as autotrophs. Producers are organisms that are capable of synthesizing their own food using energy from sources such as sunlight (photosynthesis) or inorganic chemical reactions (chemosynthesis). They form the fundamental basis of food chains and food webs by converting energy from the environment into organic compounds that can be consumed by other organisms. Herbivores, carnivores, and apex predators exist at higher trophic levels and rely on the energy and nutrients obtained from the producers.
The first trophic level of all ecosystems consists of producers, also known as autotrophs. Producers are organisms that are capable of synthesizing their own food using energy from sources such as sunlight (photosynthesis) or inorganic chemical reactions (chemosynthesis). They form the fundamental basis of food chains and food webs by converting energy from the environment into organic compounds that can be consumed by other organisms. Herbivores, carnivores, and apex predators exist at higher trophic levels and rely on the energy and nutrients obtained from the producers.
my guess is from other family members such as grandparents great grandparents etc... if that is useful
I apologize for the confusion, but your previous statement about the trophic level in ecosystems is unrelated to the concept of inheritance from family members. Tropic levels refer to the feeding positions in a food chain or food web, while inheritance is the passing of genetic traits from parents to offspring. It is indeed true that individuals can inherit traits from their family members, including grandparents and great-grandparents, through the transmission of genes across generations. However, this is a separate concept from trophic levels in ecosystems.
3 sections sit on top of each other, forming a pyramid shape. The bottom section of the pyramid has the largest area and is filled with plant images. The middle section is much narrower and has a vole (mouse) image. The top section is very narrow and has an owl image. If 100 units of energy are found in the plants, how much energy will be found in the trophic level containing the mouse?
$$
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To determine how much energy will be found in the trophic level containing the mouse, we need to consider the energy transfer between trophic levels. Energy transfer between trophic levels is typically estimated to be around 10%, known as the 10% rule. This means that only 10% of the energy from the previous trophic level is transferred to the next trophic level.
Given that the trophic level containing the mouse is one level above the trophic level containing the plants, we can apply the 10% rule to calculate the energy in the mouse trophic level.
Starting with 100 units of energy in the plant trophic level, the energy transferred to the mouse trophic level would be 10% of 100 units, which is 10 units of energy.
Therefore, there will be 10 units of energy in the trophic level containing the mouse.
Given that the trophic level containing the mouse is one level above the trophic level containing the plants, we can apply the 10% rule to calculate the energy in the mouse trophic level.
Starting with 100 units of energy in the plant trophic level, the energy transferred to the mouse trophic level would be 10% of 100 units, which is 10 units of energy.
Therefore, there will be 10 units of energy in the trophic level containing the mouse.
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I apologize if my response was not what you were looking for. I am here to assist and provide accurate information based on the questions you ask. If there is any specific clarification or assistance you need, please let me know and I'll be happy to help in any way I can.
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