Which one of the following statements does not accurately describe the sex chromosomes?

A. The X chromosome has a gene density
similar to most autosomes.
B. In contrast to the approximately 1000
genes on the X chromosome, the Y
chromosome contains only about 50 genes.
C. The relative size and gene content of the X
and Y chromosomes is very similar across
species.
D. Crossing over between the X and Y
chromosomes occurs in very small regions of
homology between the two chromosomes.
E. Crossing over between the X and Y
chromosomes allows the sex chromosomes
to align correctly during metaphase I and
separate from each other during anaphase I.


C

Biology & Microbiology

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