Jakob_Week1 - 690 R R 6 gre sen bro + + b 678 R R 7 gre res...

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Week 1 Questions 1. A three-point testcross was made in corn. The results and a recombination analysis are shown in the display below, which is typical of three point testcrosses (p = purple leaves, + = green; v = virus-resistant seedlings, + = sensitive; b = brown midriff to seed, + = plain). Study the display and answer parts a through c. P +/+ • +/+ • +/+ X p/p • v/v • b/b Gametes + • + • + p • v • b Class Progeny Phenotype F1 Gametes Numbers p-b p-v v-b 1 gre sen pla + • + • + 3,210 2 pur res bro p • v • b 3,222 3 gre res pla + • v • + 1,024 R R 4 pur sen bro p • + • b 1,044 R R 5 pur res pla p • v • +
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Unformatted text preview: 690 R R 6 gre sen bro + + b 678 R R 7 gre res bro + v b 72 R R 8 pur sen pla p + + 60 R R Totals: 10,000 1,500 2,200 3,436 a. Determine which genes are linked b. Draw a map that shows distances in map units c. Calculate interference, if appropriate 2. John and Martha are contemplating having children, but Johns brother has galactosemia (an autosomal recessive disease) and Marthas great-grandmother also had galactosemia. Martha has a sister who has three children, none of whom have galactosemia. What is the probability that John and Marthas first child will have galactosemia? (Chapter 2, Q: #31)...
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This note was uploaded on 04/05/2010 for the course MCB 104 taught by Professor Urnov during the Spring '09 term at University of California, Berkeley.

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