AP BIOLOGY

Detailed explanation-1: -Which of these would have the least effect on natural selection in a subspecies of giraffes that is geographically isolated from other subspecies of giraffes? Chromosome number is not a factor that influences natural selection. The other three choices represent factors that drive the process of natural selection.

Detailed explanation-2: -Charles Darwin held up giraffes as a prime example of natural selection, his theory that’s often summarized as “survival of the fittest.” Giraffes with comparably longer necks could reach food high up in trees, which gave them an advantage over other animals and members of their own species with shorter necks.

Detailed explanation-3: -This is ‘natural selection’. Consider the giraffe, for example. A Darwinian theory of evolution posits that it was through random variation that some giraffes had longer necks than others. Thanks to their long necks, they were able to reach leaves high up in the trees in their environment.

Detailed explanation-4: -Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

Detailed explanation-5: -Which of the following is not a result of natural selection? Explanation: Development of genetically modified organisms is an example of artificial selection due to human intervention. Desirable organisms are allowed to generate offspring, passing on the selected genes.