WRIGHT - Biology 1610 Genetics - Exam 2 Numbers 41 through 43 are associated wit
ID: 95208 • Letter: W
Question
WRIGHT - Biology 1610 Genetics - Exam 2 Numbers 41 through 43 are associated with the following information In broad winged dragonflies, eye pigment molecule production is controlled by two independently assorting genes, each with two alleles. When the dominant allele A is present at one locus and B_ at the other locus this leads to full red eye coloration; if the A allele is paired with cc genotype then this leads to golden eye phenotype. The double recessive aa at the first locus produces a pale yellow coloration regardless of alleles at the second locus aa--= yellow AB =red Abb = golden 41 If a fully homozygous red eyed dragon is crossed with a yellow variety homozygous for the b allele, then the offspring expected in the F1 generation? A. should all be red eyed and heterozygous B. should all be yellow eyed and fully homozygous C. should be seen in both red eyed and yellow eyed forms in approximately equal numbers D. should be present in all three phenotypic forms E. should be all golden eyed and be heterozygous for the A gene 42.___If a cross between a red dragon and a yellow dragon produces progeny of all three phenotypes (red,yellow golden), what are the most likely genotypes of the parents? A. AABB x aabb, B. AaBB x Aabb C. AaBb x aaBB D. AaBb x aabb 43._You carry out a true dihybrid cross....what frequencies of the three phenotypes would be expected in a total offspring population? A. .5625 RED: .1875 YELLOW: .25 GOLDEN B. .25 RED: .25 YELLOW: .25 GOLDEN C. .1875 RED:.5625 YELLOW: .25 GOLDEN D. .70 RED: .20 YELLOW: .10 GOLDEN E. .5625 RED: .25 YELLOW: .1875 GOLDEN Utilizing the pedigree given on the following page, affected individuals are shaded. Numbers 44 through 47: 44.__Which of the following modes of inheritance cannot be eliminated A. Y-linked, B. Auto. Dominant C. Auto. Recessive D. X-linked Dom E. X-linked Rec. 45_Based on your answer above. Give the genotypes of the following individuals I1 and II1 A. both a heterozygous C. both a hemizygous recessive B. both are homozygous recessive D. both are homozygous dominant 46. If individuals II-2 and II-3 had offspring what would be the expected F1 phenotypic ratios. A. All affected B. ½ affected: ½ unaffected C. ¾ affected: ¼ unaffected 47.__What would be the probability of individuals III-2 and III-6 having an affected offspring? A. 25% B. 65% C. 3096 D. 1796 E. 0%Explanation / Answer
41) Fully homozygous red eyed dragon (AABB) is crossed with yellow variety homozygous for b allele (aabb). Mating between these two are given in the table below.
All offsprings are red eyed heterozygous. Therefore, the answer for this question is option A.
AB AB AB AB ab AaBb AaBb AaBb AaBb ab AaBb AaBb AaBb AaBb ab AaBb AaBb AaBb AaBb ab AaBb AaBb AaBb AaBbRelated Questions
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