Biology, Eighth Edition (Raven)

Chapter 25: Evolution of Development

View the animation below, then complete the quiz to test your knowledge of the concept.


1.	Homologous genes are best described as genes that

		A)	have identical sequences.
		B)	have a common ancestral gene.
		C)	have similar functions.
		D)	are on the same chromosome.
		E)	are on homologous chromosomes.

2.	Homologous genes within a single species are said to be

		A)	orthologs.
		B)	paralogs.
		C)	metalogs.
		D)	xenologs.
		E)	homologs.

3.	A misaligned cross over between two homologous chromosomes usually results in

		A)	a deletion in one chromosome and no change in the other.
		B)	a deletion in one chromosome and a duplication in the other.
		C)	deletions in both chromosomes.
		D)	duplications in both chromosomes.
		E)	no change in either chromosome.

4.	Gene duplications have no effect on evolution.

		A)	True
		B)	False

5.	Homologous genes are the result of random mutations accumulated over the course of many generations.

		A)	True
		B)	False