Question

Which statement correctly describes the role of chance in evolution?
Group of answer choices

Evolution by natural selection proceeds by an accumulation of changes that occur by chance.

New alleles by random changes can only occur through genetic drift.

Mutations results in genetic variation for natural selection to occur.

Flag question: Question 12
Question 125 pts
Match the terms to the correct answers
Group of answer choices
A change in allele frequencies in a population caused when new individuals move into the population.

[ Choose ]
A change in the allele frequency of a small population due to random or chance events.

[ Choose ]
A change in the nucleotide base sequence of an organism’s DNA.

[ Choose ]
The process by which individuals that are better suited to their environment survive and reproduce more successfully than less well adapted individuals.

[ Choose ]
the process whereby certain traits or behaviors in individuals of a species make them more attractive to potential mates, increasing their chances of reproductive success.

[ Choose ]

Flag question: Question 13
Question 132 pts
Snail populations that live in separate ponds may eventually evolve into separate species.
This is due to:
Group of answer choices

geographic isolation

gametic isolation

mechanical isolation

Flag question: Question 14
Question 142 pts
New species are formed when:
Group of answer choices

individuals are separated by a physical or geographic barrier

individuals can no longer interbreed

habitats are destroyed.

Flag question: Question 15
Question 152 pts
Two species live in the same area but rarely encounter one another because one spends most of its time in the water and the other spends most of its time on land. What type of isolation does this represent?
Group of answer choices

habitat isolation

behavioral isolation

mechanical isolation

Flag question: Question 16
Question 162 pts
What is extinction?
Group of answer choices

The formation of new species due to geographic isolation.

The complete disappearance of a species from Earth.

The inheritance of acquired characteristics within a population.

Flag question: Question 17
Question 172 pts
If 1 out of 4 butterflies is blue in a population, what is the frequency of non-blue butterflies?
Group of answer choices

.75

.5

.0

Answer 1

Question 11
- Correct answer: Mutations result in genetic variation for natural selection to occur.

Question 12 (matching)
- A change in allele frequencies in a population caused when new individuals move into the population. → Gene flow (migration)
- A change in the allele frequency of a small population due to random or chance events. → Genetic drift
- A change in the nucleotide base sequence of an organism’s DNA. → Mutation
- The process by which individuals that are better suited to their environment survive and reproduce more successfully than less well adapted individuals. → Natural selection
- The process whereby certain traits or behaviors in individuals of a species make them more attractive to potential mates, increasing their chances of reproductive success. → Sexual selection

Question 13
- Correct answer: geographic isolation

Question 14
- Correct answer: individuals can no longer interbreed

Question 15
- Correct answer: habitat isolation

Question 16
- Correct answer: The complete disappearance of a species from Earth.

Question 17
- Correct answer: 0.75