Question

2) Many animal predators tend to preferentially eat familiar prey types. This behavior imposes ____________ on the prey species.

positive frequency-dependent selection

pleiotropy

a heterozygote advantage

negative frequency-dependent selection

3) Which of the following statements is true?

Natural selection can create new phenotypes from scratch.

Mutations occur in response to natural selection imposed by the environment.

Gene flow and genetic drift are capable of working against natural selection.

Organisms with very long generation times are likely to adapt easily.

4) Since whales and humans are both mammals, all of the bones in a whale flipper can be matched with bones found in the human arm, even though a whale flipper and a human arm look very different from the outside. This is an example of a(n) ____________ trait.

convergent

epistatic

analogous

homologous

Answer 1

Ans)Negative frequency dependant selection.

frequency-dependent selection is an evolutionary process by which the fitness of a phenotype depends on its frequency relative to other phenotypes in a given population.In negative frequency-dependent selection, the fitness of a phenotype decreases as it becomes more common. This is an example of balancing selection.

Ans3)Gene flow and genetic drift are capable of working against natural selection.

Natural selection cannot produces changes from scratch.It is basically selection of prexisting changes.

Mutation is present in the population already in which natural selection occurs.

Organism with smaller generation are more capable of mutations and not the ones with longer generation.

Ans4)Homologous

Homologous structures are similar in position, structure, and evolutionary origin but not necessarily in function.Both whale flipper and human hand are examples of homologous characters.