1)In Fruit flies Brown (B) is dominant to Black (b)body and at another locus on
ID: 83591 • Letter: 1
Question
1)In Fruit flies Brown (B) is dominant to Black (b)body and at another locus on the same chromosome Normal wings (N is dominant to wingless (n). A test cross was prepared by mating a homazygous recessive, BlackWingless fly with a homozygous dominant Brown wings fly. This was the Pr generation The offspring of this aoss (Fi) were hen back crossed with another homozygous recessive (Back/Wingless) fly. The Fa generation Phenotypic frequencies are shown below: 712 Brown, Normal winged flies 85 Black, Winged fies 75Brown, Wingless flies 728 Black wingless flies -On the chromosomes below, write the alleles on the loci for each parent Test Cross How many Map Units are the alleles apart?Explanation / Answer
In fruit flies brown (B) is dominant to black (b) body and at another locus on the same chromosome . normal wings (N) is dominant to wingless (n)
712 brown normal winged flies------parental
85 black winged flies-------------recombinant
75 bown wingless flies-------------recombinant
728 black wingless flies------parental
Total =1600
Recombination frequency = # recombinants/total (100) = (85 +75 )/85 +75 + 728 + 712 = 0.1(100)
= 10% = 10 units ----------------answer
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