11 Jun Color -blindness is an X-linked recessive phenotype
Question
Questions:
1. Color -blindness is an X-linked recessive phenotype. A girl of normal vision whose father is color-blind marries a color-blind man. What sort of children might they have in terms of color vision.
2. Yellow body color in Drosophila is an x-linked characteristics that is recessive to gray body color(Drosophila females are xx and males XY as in humans). A gray female mated with an unknown male and produced some yellow and some gray offspring of both sexes. What is the genotype of the original female?.What is the phenotype of the male with which she mated?
3. An albino, a non-hemophiliac man marries a normally pigmented, non-hemophiliac woman whose father has hemophilia and whose mother is albino. What kind of children might they have and in what proportions?
4. In humans, aniridia (a type of blindness) is due toan autosomal dominant allele, and optic atrophy is a recessive X-linked allele. A man blind from optic atrophy marries a woman blind from anirida. Assuming that the woman is homozygous for both genes, would any of their children be expected to be blind? If so, what type of blindness would they have?
5. A non-hemophiliac man who is blind from anirida and whose mother is not blind marries a non-hemophiliac woman who is not blind and whose father has hemophilia.If they have four sons, what phenotypes would these boys likely to have?
6. If the couple in the previous problem were to have four daughters, what would their phenotypes likely to be?
7. A color- blind woman marries a normal -visioned man and they have two color-blind sons and two daughters and two normal-visioned sons. The second son marries a normal-visioned woman and they have two-normal-visioned sons and two color-blind daughters. Diagram a pedigree of this family. What is the mode of inheritance of color blindness in this family?. Based on the mode of inheritance, determine the genotypes of all family members and indicate any unknown alleles with a question mark?
8. In a cross between a heterozygous long-winged male and a vestigial-winged female, what phenotypes and genotypes would be expected and in what proportions?
9. In a cross between two heterozygous long-winged flies, what phenotypes and genotypes would be expected and in what proportions?
10. In flies, gray body color is dominant over black body color. What would be the phenotypic and genotypic ratios of the progeny from cross between a homozygous gray fly and a homozygous black fly. What would be the result of mating two of the F1 offspring? Which of these F2 offspring would always breed true when mated with siblings of the same phenotype?
11. In humans, migraine is due to an autosomal dominant allele. A normal-visioned woman who has never suffered from migraine headaches takes her daughter to a doctor for an examination, In the examination the doctor discovers that the girl is color-blind and suffers from migraine headaches.What does the doctor automatically knows about the girl’s father?
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