alleryStart learning →Which genotype corresponds to Klinefelter syndrome?
AX0
BXXX
CXXY
DXYY
Answer & Solution
Correct answer: C. XXY
1. The XXY genotype corresponds to one type of Klinefelter syndrome.
2. Affected individuals are phenotypically male, with small testes, enlarged breasts and reduced body hair.
3. More complex types exist in which as many as five X chromosomes are present.
4. X0 is Turner syndrome and XXX is triplo-X, so neither of those matches.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 13 "Modern Understandings of Inheritance", section 13.2 Chromosomal Basis of Inherited Disorders_
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