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Chapter 4 Answers to Homework Problems

Chapter 4 Answers to Homework Problems - Answers to Chapter...

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Answers to Chapter 4 homework problems. 1. Questions and Problems, 4.1 What blood types could be observed in children born to a woman who has blood type M and a man who has blood type MN? Ans: M and MN. 3. Questions and Problems, 4.3 In mice, a series of five alleles determines fur color. In order of dominance, these alleles are: , Y A yellow fur but homozygous lethal; , L A agouti with light belly; , A + agouti (wild-type); , t a black and tan; and a, black. For each of the following crosses, give the coat color of the parents and the phenotypic ratios expected among the progeny: (a) ; Y L Y L A A A A ´ (b) ; Y L t A a A a ´ (c) ; t Y a a A a ´ (d) ; L t L L A a A A ´ (e) ; L L Y A A A A + ´ (f) ; t t A a a a + ´ (g) ; t a a aa ´ (h) ; Y L t A A A a + ´ and (i) . Y L Y A a A A + ´ Ans: Parents Offspring (a) yellow X yellow 2 yellow: 1 light belly (b) yellow X light belly 2 yellow: 1 light belly: 1 black and tan (c) black and tan X yellow 2 yellow: 1 black and tan: 1 black (d) light belly X light belly all light belly (e) light belly X yellow 1 yellow: 1 light belly (f) agouti X black and tan 1 agouti: 1 black and tan (g) black and tan X black 1 black and tan: 1 black (h) yellow X agouti 1 yellow: 1 light belly (i) yellow X yellow 2 yellow: 1 light belly 5. Questions and Problems, 4.5 From information in the chapter about the ABO blood types, what phenotypes and ratios are expected from the following matings: (a) ; A A B B I I I I ´ (b) ; A B I I ii ´ (c) ; A B I i I i ´ and (d) ? A I i ii ´ Ans: (a) all AB; (b) 1 A: 1 B; (c) 1 A: 1 B: 1 AB: 1 O; (d) 1 A: 1 O 6. Questions and Problems, 4.6 A woman with type O blood gave birth to a baby, also with type O blood. The woman stated that a man with type AB blood was the father of the baby. Is there any merit to her statement?
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