Genetics380_2008_quiz2_key - • Indicate the phenotypes...

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Genetics 380, Fall 2008 QUIZ # 2 Total = 20 points Name__________________ Section_________________ 1. For each of the term in the left, choose the best matching phrase in the right column(5 pts): a. epistasis 2 1. less than 100% of the individuals possessing a particular genotype express it in their phenotype b. incomplete dominance 4 2. the alleles of one gene mask the effects of alleles of another gene c. pleiotropy 5 3. both parental phenotypes are expressed in the F1 hybrids d. codominance 3 4. the heterozygote resembles neither homozygote e. reduced penetrance 1 5. one gene affecting more than one phenotype 2. You do a cross between two true-breeding strains of zucchini. One has green fruit and the other has yellow fruit. The F1 plants are all green, but when these are crossed, the F2 plants consist of 9 green : 7 yellow. What were the genotypes of the two parental strains (3 pts)? Two genes involved; green parent AABB; yellow parent aabb
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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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Genetics380_2008_quiz2_key - • Indicate the phenotypes...

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