Over long sequences within a chromosome
A)human and mouse DNA is dramatically different in base pair arrangement.
B)the linear order of genes is amazingly different,they have transposed.
C)the linear order of genes is amazingly different,they have reversed.
D)the linear order of genes is the same,indicating conservation of synteny.
E)the linear order of genes is the same,indicating conservation of neoteny.

Question

Quizplus · Accepted Answer

Conservation of synteny refers to the conservation of the linear order of genes within a chromosome between different species. This means that the linear order of genes will be the same over long sequences within a chromosome between humans and mice, indicating that they have conserved synteny. Choice A is incorrect because human and mouse DNA is actually very similar in base pair arrangement (~85% identical), not dramatically different. Choice B is incorrect because gene transposition is a rare event and not likely to occur over long sequences within a chromosome. Choice C is incorrect because gene reversal is also a rare event and not likely to occur over long sequences within a chromosome. Choice E is incorrect because neoteny refers to the retention of juvenile traits into adulthood and has nothing to do with gene order conservation.

Over Long Sequences Within a Chromosome