ou are doing a genetics experiment with the fruit fly. In the “P” generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. Assume the genes are not found on a sex chromosome. Indicate the body color alleles with B and b and the wing size alleles with N and n. 1) When the flies in (b) and (c) are mated, you count 1600 offspring in the F2 generation. If the body color gene and wing type genes are not linked, how many flies of each phenotype would you expect? (Be sure to use a Punnett square for a dihybrid cross to show your work.) Show your work: Expected flies if the loci are unlinked: _________: # of brown, winged flies (Genotype: ______________) _________: # of black, winged flies (Genotype: ______________) _________: # of black, wingless flies (Genotype: ______________) _________: # of brown, wingless flies (Genotype: ______________) 2) When you count the F2 generation, you actually get 85 brown, winged flies, 728 black, winged flies, 712 brown, wingless flies, and 75 black, wingless flies. These results indicate that the body color and wing size are linked genes. What are the phenotypes of the recombinant flies? (Hint: Refer back to the P generation flies inthe first paragraph. Recombinant flies do not resemble the original P g
You are doing a genetics experiment with the fruit fly. In the “P” generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings.
Assume the genes are not found on a sex chromosome. Indicate the body color alleles with B and b and the wing size alleles with N and n.
1) When the flies in (b) and (c) are mated, you count 1600 offspring in the F2 generation. If the body color gene and wing type genes are not linked, how many flies of each phenotype would you expect? (Be sure to use a Punnett square for a dihybrid cross to show your work.)
Show your work:
Expected flies if the loci are unlinked:
_________: # of brown, winged flies (Genotype: ______________)
_________: # of black, winged flies (Genotype: ______________)
_________: # of black, wingless flies (Genotype: ______________)
_________: # of brown, wingless flies (Genotype: ______________)
2) When you count the F2 generation, you actually get 85 brown, winged flies, 728 black, winged flies, 712 brown, wingless flies, and 75 black, wingless flies. These results indicate that the body color and wing size are linked genes. What are the
3) Calculate the recombination frequency (%) between the linked genes for body color and wing size.
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