Principles of Inheritance and Variation Question 59
59. A self-fertilizing trihybrid plant forms
[2004]
(a) 8 different gametes and 64 different zygotes
(b) 4 different gametes and 16 different zygotes
(c) 8 different gametes and 16 different zygotes
(d) 8 different gametes and 32 different zygotes
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Answer : a
Hints & Solution
(a) A self-fertilising trihybrid plant forms 8 different gametes and 64 different zygotes. The genotype of trihybrid plant is $AaBbCc$. Number of gametes formed $=2^{n}=2^{3}=8$ Here $n=$ no. of heterozygosity $=3$ in present case. No. of zygotes formed $=8^{2}=64$.
