Unformatted text preview: 10/27/09 Oct. 26th y+w+m+/y+w+m+ x ywm/Y y
20 m.u. w m 10 m.u. y+w+m+/ywm x ywm/Y What propor3on of the F2 male progeny will be yw+m/Y? [result of a double crossover (X.O.)] 1. 2. 3. 4. 2% 20% 15% 1% Ques3on: What would the map distance be es3mated at in a cross between genes on diﬀerent chromosomes? a) b) c) d) e) 50 m.u. 25 m.u. 100 m.u 10000 m.u. none of the above 1 10/27/09 The A gene segregates for coat colour, where the dominant A allele gives a brown coat, & the recessive a allele gives a white coat. The B gene exhibits recessive epistasis to the A gene, where the bb genotype gives a white coat, regardless of the genotype at the A gene. A cross is performed between aaBB & AAbb individuals to give an F1, & the F1 are then crossed with each other to give an F2. If the 2 genes are completely linked, what propor3on of F2 individuals will have white coats? 1. 2. 3. 4. 5. 1/2 All of them None of them 3/16 9/16 68 2 ...
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This note was uploaded on 01/10/2010 for the course BIOLOGY biol2040 taught by Professor Tamarakelly during the Fall '09 term at York University.
- Fall '09