Question

How many Barr bodies would one expect to see in cells of Turner syndrome females and

Klinefelter syndrome males?
A) one and one
B) zero and zero
C) zero and one
D) one and zero

Answer 1

In Turner syndrome, one would expect to find zero Barr bodies since there's only a single X chromosome. In Klinefelter syndrome males with the common XXY genotype, one would expect to find one Barr body.

Step-by-step explanation:

In individuals with Turner syndrome, there is only one X chromosome (XO genotype) and so there are no Barr bodies present because there is no extra X chromosome to inactivate.

In contrast, individuals with Klinefelter syndrome have at least one additional X chromosome (XXY genotype or more complex variations with additional X chromosomes), and all X chromosomes except one will form Barr bodies. Therefore, for Klinefelter syndrome with the most common XXY genotype, there would be one Barr body present in the cells.

So the answer is C) zero and one. In Turner syndrome females, there would be zero Barr bodies as there is only one X chromosome. In Klinefelter syndrome males with the XXY genotype, there would be one Barr body.