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Question 2

Is this statement True or False?

According to Mendel’s principles, 1/4 of the offspring made from a cross between two heterozygous plants will show the recessive trait.

Set up a Punnett square using the details below to see if the statement is TRUE or FALSE.

a cross between 2 plants that are both heterozygous for a trait Pp.


True
False
Question 3
Chicken Dance GIFs | TenorIt is found that in cha-cha chickens, the allele for a double comb (A) is dominant to the allele for a single comb (a). A mother with the genotype Aa and a father with the genotype Aa produce an offspring.
What is the percent chance that the offspring will have a single comb? 25
Word Bank:
0257510050
Blank 1:
25
Question 4
In rabbits, white fur (W) is dominant to black (w), and long ears (E) are dominant to short ears (e). A breeder mates two rabbits that are heterozygous (WwEe) for both traits.
What is the chance that the offspring will be white with long ears?
(You may use the easy quick method to solve. Hint= set up 2 monohybrid crosses and multiply)

a
1/16
b
3/16
c
8/16
d
9/16
Question 5
Why is meiosis needed in animals?

a
Because 2 diploid cells are required to make 1 haploid zygote
b
Because 2 haploid games are needed to produce a diploid zygote
c
Because 2 identical daughter cells are needed to repair tissues
d
Because 2 diploid cells are needed for cross-pollination
Question 6
Which statement below best summarizes the likely effects on the carbon cycle of clear-cutting, or removing all the trees, in vast areas of a forest?



a
Clear-cutting would increase the amount of carbon dioxide found in the atmosphere.
b
Clear-cutting would limit the amount of nitrogen-fixing bacteria in the area.
c
Clear-cutting would reduce the amount of carbon dioxide found in the atmosphere.
d
Clear-cutting would allow for secondary succession of smaller plants and more carbon.
Question 7

Approximately, how much energy would be available to the primary consumers per year?

a
10,000 kcal/m2/year
b
1000 kcal/m2/year
c
100 kcal/m2/year
d
10 kcal/m2/year
Question 8

a
The arrows represent the flow of energy in one direction from producers to consumers.
b
The arrows show the flow of energy and why there are many more raccoons than grass plants in the ecosystem.
c
The arrows point in the opposite direction of the flow of carbohydrates, like glucose.
d
The arrows flow of energy show most of the energy goes to the highest level consumer.
Question 9
Carbon Cycle - Please answer the following using the words in the word bank

(Word bank words can be used either once, or not at all).



Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of to make and oxygen. Both plants and animals use oxygen in the biological process of and make more CO2. The is the main regulator of CO2 in the atmosphere, because it covers most of the Earth and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other organisms. Today these deposits are burned as fossil fuels, which include , , and . More CO2 is released in the atmosphere today than in the past because of the . But is a greenhouse gas, as is water, and methane, and too much CO2 in the atmosphere may be responsible for human accelerated .

Word Bank:
photosynthesisrespirationcoaloilnatural gascarbon monoxidemethanecoalburning of fossil fuelsoilozonecarbon dioxidegreenhouse effectclimate changenatural gasoiloxygennatural gassoil erosionglucosedecayedfermentationcoalocean
Blank 1:
Blank 2:
Blank 3:
Blank 4:
Blank 5:
Blank 6:
Blank 7:
Blank 8:
Blank 9:
Blank 10:
Blank 11:

1 answer

Answer to Questions:

Question 2: True or False The statement is True.

Mendel's principles state that when crossing two heterozygous plants (Pp x Pp), the resulting phenotypic ratio among the offspring is 3:1, meaning that 1 out of 4 offspring will show the recessive trait.

Punnett Square:

      P    p   
    ___________
  P |  PP |  Pp |
    |-----|-----|
  p |  Pp |  pp |

The results show:

  • 1 PP (dominant)
  • 2 Pp (dominant)
  • 1 pp (recessive) Thus, 1 out of 4 = 1/4 shows the recessive trait.

Question 3: Percent chance of single comb The percent chance that the offspring will have a single comb is 25.

This is because with the genotype Aa x Aa, the Punnett square will yield:

      A    a   
    ___________
  A |  AA |  Aa |
    |-----|-----|
  a |  Aa |  aa |

Where the lowest count is aa (single comb), which is 1 out of 4, or 25%.

Question 4: Chance of white with long ears The chance that the offspring will be white with long ears is d: 9/16.

Steps for the easy method:

  • White fur (W) is dominant to black (w), so:
    • Probability of white = P(W) = P(WW or Ww) = 3/4.
  • Long ears (E) are dominant to short (e), so:
    • Probability of long ears = P(E) = P(EE or Ee) = 3/4.

Now, combine the probabilities of both traits:

  • Total Probability of white with long ears = (3/4) * (3/4) = 9/16.

Question 5: Reason for Meiosis in Animals The answer is b: Because 2 haploid gametes are needed to produce a diploid zygote.

Meiosis creates gametes (haploid cells), which combine during fertilization to form a diploid zygote.

Question 6: Effects of Clear-Cutting on Carbon Cycle The best summary statement is a: Clear-cutting would increase the amount of carbon dioxide found in the atmosphere.

Removing trees (which absorb CO2) leads to less carbon being fixed, resulting in more CO2 present in the atmosphere.

Question 7: Energy Available to Primary Consumers The approximate energy available to the primary consumers per year is b: 1000 kcal/m2/year.

In ecological efficiency, around 10% of the energy from producers goes to the primary consumers.

Question 8: Flow of Energy Arrows The correct statement is a: The arrows represent the flow of energy in one direction from producers to consumers.

Energy flows from one trophic level to the next in one direction.

Question 9: Carbon Cycle Fill-in Word Bank Fill-ins:

  • Blank 1: photosynthesis
  • Blank 2: glucose
  • Blank 3: respiration
  • Blank 4: ocean
  • Blank 5: decayed
  • Blank 6: coal
  • Blank 7: oil
  • Blank 8: natural gas
  • Blank 9: burning of fossil fuels
  • Blank 10: carbon dioxide
  • Blank 11: climate change

Final Sentence Assembly: Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of photosynthesis to make glucose and oxygen. Both plants and animals use oxygen in the biological process of respiration and make more CO2. The ocean is the main regulator of CO2 in the atmosphere, because it covers most of the Earth and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other decayed organisms. Today these deposits are burned as fossil fuels, which include coal, oil, and natural gas. More CO2 is released in the atmosphere today than in the past because of the burning of fossil fuels. But carbon dioxide is a greenhouse gas, as is water, and methane, and too much CO2 in the atmosphere may be responsible for human accelerated climate change.