Loci Question
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Loci Question
Two unlinked loci, A and B, perform the same function in production of pigment in
flowers so one or other is required for pigment. Both loci have recessive alleles, a and b
respectively, which are defective.
In the offspring of a cross between two doubly heterozygous individuals
what phenotypes are expected and in what ratios?
Include genotypes of all individuals and gametes, using
correct genetic notation.
flowers so one or other is required for pigment. Both loci have recessive alleles, a and b
respectively, which are defective.
In the offspring of a cross between two doubly heterozygous individuals
what phenotypes are expected and in what ratios?
Include genotypes of all individuals and gametes, using
correct genetic notation.
chousta- Student
- Posts : 3
Join date : 2008-08-07
Re: Loci Question
First, you have to make a cross between AaBb x AaBb. Gametes would be AB, Ab, aB, and ab for each parent. Since both A and B perform same function, you would expect all progeny containing at least one dominant loci (either A or B) to produce pigment. The only genotype that would result in the lack of pigment would be aabb. So, 15/16 would produce pigment and 1/16 would not.
Alla- Instructor
- Posts : 103
Join date : 2008-02-27
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