Answer to Question #162279 in Biology for Anas

Question #162279

solve this problem: Unicornism is an X linked recessive trait. A normal man marries a normal woman and they have many children. 


They have normal and unicorned boys, and all the girls are normal.


Using a punnet square and also showing the genotypes of the parents and children explain how this can happen .

Expert's answer

Since the man and woman have unicorned boys and the man is normal, the woman is heterozygous and is a carrier of the recessive trait. As a result, a male genotype is XuY and a female genotype is XUXu. The parents produce the possible gametes:

Male: XuY;

Female: XU and Xu.

The genotypes of their children are shown in the Punnett square:

As a result, all girls have dominant allele and are healthy while boys with recessive allele are unicorned.

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