FOR QUESTIONS 47, 48, 49 & 50, BASE RESPONSE ON THE FOLLOWING INFORMATION in a s
ID: 215144 • Letter: F
Question
FOR QUESTIONS 47, 48, 49 & 50, BASE RESPONSE ON THE FOLLOWING INFORMATION in a species of tropical birdt wing feather coloration is controlled by the action of 6 locl R D, G Y Aand B. alleles R and D and d, etc Completedominance occurs at each locus The R and D loci exhibit additive gene action: R D bird have dark red wings rdd birds have pink wings: and all other genotypic combinations at these loci resuit in birds with pale red wings The G locus is dominantly epistatic to the R and D loot G birds exhibit green wing coloration. The Y locus is recessively episfatic to the R.D and G loct yy birds have yellow wings The A and B loci control pigment production and are recessively epistatic to the color loct; aa and'or bb birds have white wings Re dominance is required at both locl for pigment production RrDdGgYyAaBbx rrddggYYAaBb 47. From the mating above, what proportion of the progeny would be expected to exhibit the c 8/32 d 1/128 48. matermal phenotype? From the mating above, what proportion of the progeny would be expected to exhibit the b. 9/32 c 1/16 49 An inbred pale red wing female is mated with a white male. The F1 (subscript 1) progeny are mated among themselves. What is the largest proportion of the F2 (subscript 2) progeny that would be expected to exhibit green wing feathers? c 916 d 3/16 50. A green winged female is mated with a yellow winged male. What is the largest proportion of their progeny that would be expected to exhibit pale red wings? e allExplanation / Answer
Rr Dd Gg Yy Aa Bb x rr dd gg YY Aa Bb
Forked line method :
Rr x rr : 2/4 Rr and 2/4 rr
Dd x dd : 2/4 Dd and 2/4 dd
Gg x gg : 2/4 Gg and 2/4 gg
Yy x YY : 4/4 (1) dominant
Aa x Aa : 3/4 dominant and 1/4 recessive
Bb x Bb : 3/4 dominant and 1/4 recessive
To express paternal phenotype : 2/ 4 x 2/4 x 2/4 x 1 x 3/4 x 3/4 = 72/1024 = 9/128
47) Answer : 9/128
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.