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Question

In a plant, three dominant independently assorting genes A, B and C are essential for production of purple pigment. If any of the genes or all three genes are present in recessive condition then flower is colourless.
Raw material AXBYCZ pigment
A purple plant with genotype AABBCC cossed with a clourless plant with genotype aabbcc gives purple F1 hybrid. On selfing of F1, what will be the proportion of coloured offspring in F2?

A
2764
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B
164
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C
964
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D
3764
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Solution

The correct option is A 2764
In the given case, inheritance is controlled by three genes. So, it is a case of polygenic inheritance. In this type of inheritance, the dominant alleles have cumulative effect with each dominate allele expressing a part of the trait, the full being shown only when all the dominant alleles are present.
In this case, during the selfing of F1, AaBbCc results in the formation of 8 kinds of gametes in each sex which gives 64 combinations in F2 having 7 phenotypes. Out of these 64 combinations, only 27 combinations will show coloured offspring. So, its proportion will be 2764.

782909_221716_ans_87e8d006859c4179bde7e11c0b7ba90e.jpg

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