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Nondisjunction of the ______ chromosome during meiosis can produce offspring that are XXX or XXY.

Question

Nondisjunction of the ______ chromosome during meiosis can produce offspring that are XXX or XXY.

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Solution

Nondisjunction of the X chromosome during meiosis can produce offspring that are XXX or XXY.

Here's the step-by-step explanation:

  1. Normal human cells contain 23 pairs of chromosomes for a total of 46. One pair, the sex chromosomes, determines the individual's sex. Females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).

  2. During meiosis, the process that produces eggs or sperm, these pairs of chromosomes are supposed to separate, so that each egg or sperm gets one chromosome from each pair.

  3. Nondisjunction is when the chromosomes do not separate properly. This can happen in any chromosome, but in this case, we're talking about the X chromosome.

  4. If nondisjunction happens during the formation of an egg, the egg could end up with two X chromosomes instead of one. If this egg is fertilized by a sperm that also contains an X chromosome, the result is an individual with three X chromosomes (XXX).

  5. Similarly, if an egg with two X chromosomes is fertilized by a sperm with a Y chromosome, the result is an individual with two X chromosomes and one Y chromosome (XXY).

So, nondisjunction of the X chromosome during meiosis can produce offspring that are XXX or XXY.

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