Turner syndrome is a human disease that affects girls. It is the result of havin

Question

Turner syndrome is a human disease that affects girls. It is the result of having only one X chromosome and is caused by nondisjunction during meiosis. Recall that red-green color blindness is a recessive X-linked trait in humans. A man with normal vision mates with a woman with normal vision whose father was color blind. Their child is color blind and has Turner syndrome. In which parent did nondisjunction occur?

A. Mother

B. Father

C. It could've happened in either the mother or the father.

D. It happened in both the mother and the father.

Explanation / Answer

The correct option is B.

Explanation: Turner syndrome is a chromosomal disease that affects the development in females before and after the birth. People usually have 2 sex chromosomes in each cell; females have XX chromosomes and males have XY chromosomes. Turner syndrome occurs when one X chromosome is missing and structurally altered. The chromosomal abnormality occurs during meiosis and resulting in nondisjunction reproductive cells with 45 chromosomes in a progeny cell. Similarly, red-green color blindness is recessive and X-linked condition in humans.

In the purview of above facts, we can say that the nondisjunction occurs in father during gametogenesis and she didn’t get X chromosome from her father. Since, the child is color blind and had received second X chromosome from her mother (mother’s father was color blind and mother gets color blind allele from his father and pass on to her daughter).

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