25 Jun A woman who has blood type O and blood type M marries a man
Question
1. (10pts) A woman who has blood type O and blood type M marries a man who has blood type AB and blood type MN. If we assume that the genes for the A-B-O and M-N bloodtyping systems assort independently, what blood types might the children of this couple have, and in what proportions?
2. (10pts) On a national talk show a woman was claiming that a man was the father of her child. She had blood type AB. The child had type B. The suspected father had type O. The suspected father maintained the claim that since he had type O blood he could not be the father. You have been called in as an expert witness. Explain why or why not the man could be the father of the child.
3. (10pts) Fruit flies homozygous for the recessive mutation scarlet have bright red eyes because they cannot synthesize brown pigment. Fruit flies homozygous for the recessive mutation brown have brownish-purple eyes because they cannot synthesize red pigment. Fruit flies homozygous for both of these mutations have white eyes because they cannot synthesize either type of pigment. The brown and scarlet mutations assort independently. If fruit flies that are heterozygous for both of these mutations are intercrossed, what kinds of progeny will they produce, and in what proportions?
4. (10pts) Multiple crosses were made between true-breeding lines of black and yellow Labrador retrievers. All the F1 progeny were black. When these progeny were intercrossed, they produced an F2 consisting of 91 black, 39 yellow, and 30 chocolate. Propose an explanation for the inheritance of coat color in Labrador retrievers.
5. (10pts) The trait of wavy flowers in petunias is determined by the genetic condition PP’. Plants with flat flowers are PP, while plants with curly flowers are P’P’. A cross is made between two plants each with wavy flowers. If they produce 200 seedlings, what phenotypes and in what numbers would you expect? What is the term for this allelic relationship?
6. (10pts) A male with singed bristles appeared in a culture of Drosophila. How would you determine if this unusual phenotype was due to an X-linked mutation?
7. (20 points) A man who has color blindness and type O blood has children with a woman who has normal color vision and type AB blood. The woman’s father had color blindness. Color blindness is determined by an X-linked gene, and blood type is determined by an autosomal gene.
(a) What are the genotypes of the man and the woman?
(b) What proportion of their children will have color blindness
and type B blood?
(c) What proportion of their children will have color blindness
and type A blood?
(d) What proportion of their children will be color blind and
have type AB blood?
8. (10pts) A man with hemophilia mates with a woman who is normal but whose father was a hemophiliac, mother was normal, and whose maternal grandmother was a hemophiliac. What percentage of their sons could be hemophiliacs?
9. (10pts) Assume that coat color in cats is an X-linked trait. Briefly explain why only females can exhibit a combination of coat colors (i.e. Calico) whereas normal XY males can only exhibit one
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