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Which Statement BEST Summarizes Our Current Understanding of the Origin

Question 40

Multiple Choice

Which statement BEST summarizes our current understanding of the origin of the Y chromosome?

A) The Y chromosome is thought to have arisen spontaneously in an ancestor of mammals millions of years ago.
B) The Y chromosome is thought to have arisen as a fusion of two autosomes.
C) The Y chromosome is thought to have arisen as a broken fragment of the X chromosome.
D) The Y chromosome is thought to have been derived along with the X chromosome from a pair of autosomes.
E) The Y chromosome arose from the fusion of the X chromosome with one of the autosomes.

Correct Answer: