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Question
Which of the following is the reason that People have an extra X chromosome?
Which of the following is the reason that People have an extra X chromosome?
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Solution
The correct option is A Nondisjunction
In the first meiotic division 2 homologous chromosomes pass into 2 separate cells. During the second meiotic division or during mitosis, 2 chromatids pass into 2 separate cells. When this process of separation of chromosomes fail, which is known as non-disjunction, people have an extra chromosome (XXY).
In the first meiotic division 2 homologous chromosomes pass into 2 separate cells. During the second meiotic division or during mitosis, 2 chromatids pass into 2 separate cells. When this process of separation of chromosomes fail, which is known as non-disjunction, people have an extra chromosome (XXY).
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