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PS3B - Problem Set 3B Chromosome variation 1 A corn plant...

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Unformatted text preview: Problem Set 3B Chromosome variation (lectures 14, 15) 1. A corn plant is heterozygous for a reciprocal translocation and is semi-sterile. You cross this plant with a non-translocation homozygote for a recessive mutation b (brachytic) on chromosome 2. You obtain a semi-sterile F1 and backcross it to the homozygous brachitic srain. In the F2 you ¡nd the following: 334 semi-sterile non-brachytic 27 fertile non-brachytic 42 semisterile brachytic 279 fertile brachytic Does the translocation include chromosome 2? Justify your answer, showing all crosses and chromosomes of progeny classes. (Hint: work out the segregation ratios for the two cases: either chromosome 2 is part or is not part of the translocation.) 2. Chromosomally normal corn plants have a locus p on chromosome 1 that determines leaf color and a locus s on chromosome 5 that determines ear size: P = dark leaves, p = light leaves S = large ears, s = small ears A plant of genotype Pp Ss has dark leaves and large ears. Upon sel¡ng this...
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