Klinefelter syndrome is characterized by which chromosome composition?

Enhance your knowledge of cell division for the Alberta Biology 30 exam with multiple-choice questions and detailed explanations. Prepare confidently for your test!

Multiple Choice

Klinefelter syndrome is characterized by which chromosome composition?

Explanation:
Klinefelter syndrome is a sex chromosome aneuploidy in a male, where an extra X chromosome is present, giving the genotype XXY (47,XXY). This extra X typically arises from nondisjunction during gamete formation, so the resulting zygote has one more X than normal. The presence of the additional X in a male affects development and fertility, distinguishing it from other chromosome patterns. The other patterns correspond to different conditions: XYY is a male with an extra Y; XXX is a female with an extra X; and XO is Turner syndrome in a female with a missing X. Thus, XXY best matches Klinefelter syndrome.

Klinefelter syndrome is a sex chromosome aneuploidy in a male, where an extra X chromosome is present, giving the genotype XXY (47,XXY). This extra X typically arises from nondisjunction during gamete formation, so the resulting zygote has one more X than normal. The presence of the additional X in a male affects development and fertility, distinguishing it from other chromosome patterns. The other patterns correspond to different conditions: XYY is a male with an extra Y; XXX is a female with an extra X; and XO is Turner syndrome in a female with a missing X. Thus, XXY best matches Klinefelter syndrome.

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