Which of the following is the best statement about natural selection? explain how you got your answer.

a. most populations of organisms evolve to become more and more alike, eventually becoming genetic clones

b. some individuals in a population have a variation that gives them an advantage to survive and reproduce.

c. if a population becomes isolated from others, the possibility for mutations to occur decreases and extinction results.

d. a stable environment and less variations in a population’s gene pool promotes evolution of new species.

B. Some individuals in a population have a variation that gives them an advantage to survive and reproduce.

Explanation:

The organisms adapt or die, which is Darwin's "survival of the fittest." The ones that adapt will increase, and eventually become a seperate species.

D. 1/64

Explanation:

When we say homozygous recessive, you are looking for a pair of alleles that are both in lower case. This means that the recessive trait will be shown phenotypically. So the genotype that you are looking for in the Punnet would be:

aabbcc

Because it says reecssive for all three traits. To get the ratio, all you have to do is count how many times the combination occurs in the Punnet out of the total number of outcomes.

Attached is a Punnet for this scenario.

As you can see it only occurs once out of the 64 possible combinations.

So the answer would be 1/64.