Introduction to Genetic Analysis 143

Introduction to Genetic Analysis 143 - 44200_04_p115-150...

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142 Chapter 4 Eukaryote Chromosome Mapping by Recombination 10. A three-point testcross was made in corn. The re- sults and a recombination analysis are shown in the following display, which is typical of three-point testcrosses ( p ± purple leaves, 1 ± green; v ± virus- resistant seedlings, 1 ± sensitive; b ± brown midriff to seed, 1 ± plain) . Study the display and answer parts a–c. P 1 / 1 ² 1 / 1 ² 1 / 1 ³ p / p ² v / v ² b / b Gametes 1 ² 1 ² 1 p ² v ² b F 1 1 / p ² 1 / v ² 1 / b ³ p / p ² v / v ² b / b (tester) a. Determine which genes are linked. b. Draw a map that shows distances in map units. c. Calculate interference, if appropriate. Progeny Class phenotypes F 1 gametes Numbers p bp vv b 1 gre sen pla 1 ² 1 ² 1 3,210 2 pur res bro p ² v ² b 3,222 3 gre res pla 1 ² v ² 1 1,024 R R 4 pur sen bro p ² 1 ² b 1,044 R R 5 pur res pla p ² v ² 1 690 R R 6 gre sen bro 1 ² 1 ² b 678 R R 7 gre res bro 1 ² v ² b 72 R R 8 pur sen pla p ² 1 ² 1 60 R R Total 10,000 1,500 2,200 3,436 Recombinant for U NPACKING THE P ROBLEM 1. Sketch cartoon drawings of the parent P, F
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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