Prenatal genetic testing that counts the number of Barr bodies in a chromosome is able to determine:
A) The genetic sex of a child
B) Susceptibility to hemophilia B
C) The presence of fragile X syndrome
D) Fetal viability
Ans: A
Feedback:
The genetic sex of a child can be determined by microscopic study of cell or tissue samples because the total number of X chromosomes (which determine sex) is equal to the number of Barr bodies plus one. Genetic testing can reveal the presence of inherited disorders such as fragile X syndrome and hemophilia, but the focus of such testing is not the Barr bodies. Similarly, overall fetal viability is not ascertained from identifying Barr bodies.
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