What genetic disorder is the result if an individual possesses an XXY chromosome configura-tion?
a. Turner
b. Klinefelter
c. Down
d. Fragile X
ANS: B
Individuals with at least two X chromosomes and one Y chromosome in each cell (47 XXY kar-yotype) have a disorder known as Klinefelter syndrome. A condition with the presence of a sin-gle X chromosome and no homologous X or Y chromosome, so the individual has a total of 45 chromosomes, is known as Turner syndrome. Down syndrome is a trisomy. Fragile X syndrome is due to a break or a gap in a chromosome, not an extra chromosome.
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