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Unformatted text preview: • Indicate the phenotypes , with frequencies , of the progeny of a testcross of the F1 plants (2pts)? ¼ AaBb, ¾ aaBb, Aabb, aabb 3. Three genes in fruit flies affect a particular trait, and one dominant allele of EACH gene is necessary to get a wild-type phenotype. What phenotypic ratios would you predict among the progeny if you crossed triply heterozygous flies (4pts)? 27/64 wild type 37/64 mutant 4. Assume that the trihybrid cross AABBrr X aabbRR is made in a plant species in which A and B are dominant but there is no dominance between R and r. Consider the F2 progeny from this cross, and assume independent assortment. (6 pts) • How many phenotypic classes are expected (2 pts)? 2x2x3=12 • What is the probability of the parental aabbRR genotype (2 pts)? ¼ x ¼ x 1/4 =1/64 • What proportion would be expected to be homozygous for all three genes (2 pts)? ½ x ½ x1/2 =1/8...
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- Fall '08
- Genetics, Zygosity, yellow parent aabb, b. incomplete dominance