The reason that missing chromosomes and extra sex chromosomes do NOT cause more harm than they do is best explained by the
A) inactivation of any X beyond the first as a Barr body.
B) presence of genes on the Y chromosome that determine maleness.
C) presence of genes on the X chromosomes that determine femaleness.
D) loss of a sex chromosome in normal cells as embryo development occurs.
E) a higher level of gene-repair enzyme activity on sex chromosomes.

Question

Quizplus · Accepted Answer

As long as one X chromosome is present the individual can develop in a relatively normal fashion although there can be problems with reproduction. Additional X chromosome will simply be deactivated forming a Barr body for each one.Bloom's

The Reason That Missing Chromosomes and Extra Sex Chromosomes Do