20. Most of the genetic variation that occurs in a population results from: a. hybridization b. mutation c. recombination d. gene flow.

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Casey DurganLv2

30 Jan 2018

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Which of the following best describes the principle of evolution by natural selection?

A. Individuals within a population are genetically identical and natural selection occurs randomly

B. Individuals within a population exhibit genetic variation and those that are best adapted to their environment survive

C. Individuals within a population exhibit genetic variation and those that are least adapted to their environment survive

D. Individuals within a population undergo genetic mutation and natural selection occurs randomly

E. Individuals within a population exhibit genetic variation and natural selection occurs randomly

What do biologists call variation that is caused by a change ina gene in a germ cell?

a) mutation b) gene flow c) genetic drift d) allele

Which of the following statements about a population in whichall individuals have identical phenotypes is FALSE?

	A.	This population lacks variation in fitness
	B.	Although their phenotypes are identical, they may varygenetically
	C.	Mutation, gene flow or genetic drift would need to occur inorder for the population to evolve
	D.	This population may grow or shrink over time
	E.	All individuals will have identical reproduction andsurvival