BIO 202 HW 3

BIO 202 HW 3 - BIOL 202 HOMEWORK#3 Student's Name_KEY...

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BIOL 202 Student’s Name_________________________ KEY__ HOMEWORK #3 Section number and TA’s name:_________________ DUE: Feb 14/15 in your discussion section. IMPORTANT: Please type (not hand-write) your answers onto the question sheet itself (this sheet). Please highlight or otherwise indicate the parts that you have typed with underlining or bold ing. If additional working is required, it will be specifically stated so in the question, and whether the working should be shown on the answer sheet or a supplemental sheet will also be stated. 1. A color-blind man marries a homozygous normal woman, and after four joyful years of marriage, they have two children. Unfortunately, both children have Turner syndrome, although one has normal vision and one is color blind. The type of color blindness is an X-linked recessive trait. a. For the colorblind child, did nondisjunction occur in the mother or the father? Explain your answer. Non-disjunction occurred in the mother. Since the child is colorblind and color blindness is X-linked recessive, she inherited her X chromosome from her father, as she should have. The mother did not donate an X chromosome to her daughter (if she did the child would have color vision), therefore non-disjunction occurred in the mother causing her egg to lack an X chromosome . (0.5pts for answering mother and 0.5pts for explanation) b. For the child with normal vision, in which parent did nondisjunction occur? Explain your answer. Non-disjunction occurred in the father. The child has normal vision so she got a normal X chromosome from her mother. The father produced a sperm cell without an X chromosome, which fertilized the egg that produced this child. (0.5pts for answering mother and 0.5pts for explanation) (2 points) 2. A man employed at a nuclear power plant becomes the father of a hemophiliac boy. There is no hemophilia in the extended family history of either the man or his wife. Another man, also employed for several years in
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This note was uploaded on 04/25/2008 for the course BIOL 202 taught by Professor Staff during the Spring '08 term at New Mexico.

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BIO 202 HW 3 - BIOL 202 HOMEWORK#3 Student's Name_KEY...

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