Multiple Choice
In humans, how many chromosomes does a child inherit in total from both parents?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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Nondisjunction of the ______ chromosome during meiosis can produce offspring that are XXX or XXY.
A
18
B
X
C
21
D
Y
Verified step by step guidance1
Understand that nondisjunction is the failure of chromosome pairs to separate properly during meiosis, leading to gametes with abnormal numbers of chromosomes.
Identify that the problem mentions offspring with XXX or XXY chromosome compositions, which involve variations in the sex chromosomes.
Recall that the sex chromosomes in humans are X and Y, and that nondisjunction involving these chromosomes can lead to conditions such as Triple X syndrome (XXX) or Klinefelter syndrome (XXY).
Recognize that chromosomes 18 and 21 are autosomes and their nondisjunction leads to different syndromes (e.g., Edwards syndrome for 18, Down syndrome for 21), not XXX or XXY.
Conclude that the chromosome involved in nondisjunction producing XXX or XXY offspring is the X chromosome.
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