Dihybrid Cross: In fruit flies: Long (L) allele is dominant for wing length Shor

Question

Dihybrid Cross: In fruit flies: Long (L) allele is dominant for wing length Short (l) allele is recessive Gray Bodied (G) is dominant Black (g) is recessive for the two offspring phenotypic ratios are: 9:3:3:1 and1:1:1:1. What are the genotypes of the P generation? Dihybrid Cross: In fruit flies: Long (L) allele is dominant for wing length Short (l) allele is recessive Gray Bodied (G) is dominant Black (g) is recessive for the two offspring phenotypic ratios are: 9:3:3:1 and1:1:1:1. What are the genotypes of the P generation?

Explanation / Answer

A) To get a 9:3:3:1 ratio, the parents have to be bothheterozygous. Therefore the genotype for P generation for 9:3:3:1is LlGg and LlGg. B) To get a 1:1:1:1 ratio, one parent has to be homozygousrecessive while the other one has to be heterozygous. Therefore thegenotype for P generation for 1:1:1:1 is llgg and LlGg.

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