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A self-fertilizing trihybrid plant forms

1. 8 different gametes and 64 different zygotes
2. 4 different gametes and 16 different zygotes
3. 8 different gametes and 16 different zygotes
4. 8 different gametes and 32 different zygotes

Correct answer: 8 different gametes and 64 different zygotes

Solution

A trihybrid has three independently assorting heterozygous loci, so it can produce 2^3 = 8 gamete types. When it self-fertilizes, each parent contributes 8 gamete types, giving 8 × 8 = 64 possible zygote combinations.

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