In house cats, eye color can be gray, blue, green, or brown; each variation bree
ID: 41896 • Letter: I
Question
In house cats, eye color can be gray, blue, green, or brown; each variation breeds true Homozygous parents were bred and the foIIowing offspring were produced (?ros% Two gene pairs are involved in the inheritance of cat eye color. Define symbols and identify which genotypes produce which phenotypes In the clover butterfly, males are always yellow but females can be yellow or white. In females, white is a dominant allele. Two yellow butterflies were crossed to yield an F1 generation consisting of 50% yellow males, 25% yellow females, and 25% white females. Describe how thi trait is inherited and the genotypes of the butterfly parentsExplanation / Answer
In A:
GG(Green) x gg(Gray)
=Gg in F1 - All Green
When Gg xGg in F2
Results in GG:Gg:Gg:gg
G being dominant Shows Green color in all 3 and gg is Gray
In B:
GG(Green) x BB(Brown)= GB in F1 generation (All green)
GB x GB in F2
=GG:GB:GB:BB; G being Dominant shows green color in 3 and BB comes as Brown.
In C:
Phenotype Ratio is 9:3:3:1 because of Epistatic gene interaction, in which an allele of one gene prevents the expression of alleles at other genes. So 9:3:3:1 ratio appears in phenotype in F2 generation of Dihybrid cross involving dominant and recessive alleles.
The result is as follows:
1. GGBB
2. GgBB
2. GGBb
4. GgBb
1+2+2+4= 9/16 Green Due to G_B_ combination of alleles
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1. GGbb
2. Ggbb
1+2=3/16 Brown Due to G_bb allele
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1. ggBB
2. ggBb
1+2=3/16 Gray Due to ggB_ allele
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1. ggbb Blue Due to ggbb allele
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In butterfly, its just the traditional 1:2:1 ratio in genotype, 25:50:25, that is coming in A and B cases of above Answer.
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