in fruit flies, long wings is dominant to vestigial (undeveloped) wing. A vestig

Question

in fruit flies, long wings is dominant to vestigial (undeveloped) wing. A vestigial wing male is crossed with homozygous long wing female fruit fly. Calculate F1 and F2 generations, List phynotypic and genotypic ratios for F2 generations.

Explanation / Answer

Let the F allele = long wings (dominant) Let the f allele = vestigal wings (recessive) Vestigal wing = ff genotype Homozygous long wing = FF genotype Parental (P) cross: FF x ff --> Mendel's law of segregation says allele pairs segregate during gamete formation FF genotype will produce gamete containg the F allele ff genotype will produce gamete containing the f allele Fusion of gametes gives F1 Generation: Ff (long wings) F1 x F1 --> F2 Generation Ff x Ff Both Ff gentoypes in the cross above will produce gametes containing both the F and f alleles. We must draw a punnett square to solve for the genotypic and phenotypic ratios in the F2 generation. Draw a square with four boxes. On the side, you'll have the gametes F and f. Do the same thing for the top. You should end up with the following genotypes: 1/4FF, 2/4/Ff = 1/2Ff, 1/4ff --> gentotypic ratio is 1:2:1 and phenotypic ratio is 3:1 (3 long winged and 1 vestigal winged) Hope this helps! :-)

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