Question

You identify a gene (gene 1) in once species (species 1) that shares significant homology to a gene (gene 2) in a second species (species 2). Species 1 and species 2 share a common ancestor. Gene 1 and Gene 2 lie within in blocks of sequences that show synteny between the two species. You determine the number and identity of synonymous and non-synonymous sequence changes in the coding sequences when comparing the two genes. From these data alone (i.e., without any additional information), you can predict/determine which of the following:

Question options:

	a). How much evolutionary time has passed since the time that that the two species diverged in evolution and whether specific sequence changes might have driven differences in functions between the two genes.
	b). Whether selective pressure may have acted on these genes to diversify their sequences.
	c). Which of the two genes (Gene 1 or Gene 2) shows more resemblance to a gene that was in the ancestral species that gave rise to species 1 and species 2.
	d). Whether Gene 1 and Gene 2 are paralogs or orthologs
	e). Both a) and c)
	f). Both a) and b)

Answer 1

The answer is both a and c.we can predict the sequence changes that caused differences.we can also find out which Gene shows resemblence with ancestral Gene.