Experiment 1 :
Genotype of heterozygous Tall with antenna = TtAa
Test cross = TtAa (tall-antennae) * ttaa (dwarf-no antennae)
Gametes of TtAa = TA, Ta, tA, ta
Gametes of ttaa = ta
Progeny: TtAa (Tall-antennae) , Ttaa (Tall-no antennae) , ttAa (dwarf-antennae) , ttaa (dwarf-no antennae)
Given figures in the question :
No of tall-antennae (TtAa) = 46 (Parental)
No of dwarf - no antennae (ttaa) = 42 (Parental)
No of tall - no antennae (Ttaa) = 5 (Recombinant)
No of dwarf-antennae (ttAa) = 7 (Recombinant)
Total offspring = 46 + 42 + 5 + 7 = 100
Recombinant frequency = recombinat offspring / total offspring
= ( 5+7) / 100 = 0.12 = 12%
Experiment 2 :
Genotype of heterozygous antannae-upturned snout = AaSs
Test cross : AaSs (antennae-upturned snout) * aass (no antennae-downturned snout)
Gametes of AaSs = AS, As, aS, as
Gametes of aass = as
Progeny : AaSs, Aass, aaSs, aass
Given figures:
AaSs (antennae-upturned snout) = 47 (parental)
Aass (antennae-downturned snout) = 2 (recombinant)
aaSs (no anntennae-upturned snout) = 3 (recombinant)
aass (no antennae-downturned snout) = 48 (parental)
Total offspring = 47+2+3+48 = 100
Recombinant frequency = recombinant offspring / total offspring
= (2+3) / 100 = 0.05 = 5%
Recombinant frequency of first experiment is 12% and second experiment is 5%
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