Color blindness carries a recessive allele (d) linked to the X chromosome.

| March 26, 2021 | education

Color blindness carries a recessive allele (d) linked to the X chromosome. What is the probability of having a child with color blindness in healthy parents, one of whom is a carrier of this disease? Make diagrams of the genotypes of parents and children.

Given: gene d-color blindness, linked to the X chromosome. The genotypes of the parents are as follows: father XDY, mother XDXd. The father forms the following types of gametes XD and Y. The mother forms the following types of gametes XD and Xd. After crossing, first generation hybrids are formed with the following genotypes XDX D, XDXd, XDY, XdY. By phenotype, all girls are born healthy, but one of the girls is a carrier of the gene for color blindness. Of the boys, one is born healthy, and the other will have color blindness. Phenotypic cleavage has a 3: 1 ratio.



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