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30 May, 09:24

Which statement accurately describes how identification of individuals through the use of genetic engineering is possible?

A. The Y chromosome doesn't experience crossing-over.

B. The X chromosome can only be passed from a father to his son.

C. The DNA in mitochondria is passed from mother to child in the nucleus of a cell.

D. The mitochondria DNA in a mother and her offspring vary greatly.

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  1. 30 May, 13:15
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    The answer is A. The Y chromosome doesn't experience crossing-over.

    The crossover of chromosomes is the exchange of genetic material between homologous chromosomes. In males, X and Y chromosomes pairs but they cannot exchange genetic material except at the ends of the chromosomes called pseudoautosomal regions. So, greatly, the Y chromosome doesn't experience crossing-over.

    Through the process of elimination:

    B. A mother gives X chromosome and a father gives Y chromosome to the son.

    C. The mitochondria cannot be passed in the nucleus of a cell since it is another organelle.

    D. It is thought that mitochondria is passed only from mother to her offspring, so they cannot vary greatly.
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