The karyotype of a person is 47, XY, +21 . This person is a
a. Normal male
b. Male with Down syndrome
c. Normal female
d. Female with Turner syndrome
B
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A A normal male has 46 chromosomes.
B This person is male because his sex chromosomes are XY. He has one extra copy
of chromosome 21 (for a total of 47 instead of 46), resulting in Down syndrome.
C A normal female has 46 chromosomes and XX for the sex chromosomes.
D A female with Turner syndrome has 45 chromosomes; the sex chromosomes
have just one X.
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