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Question

What will be the percentage of gametes having recessive alleles for both the genes, if produced by a plant with genotype TtRr?

A

50%

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B

12.5%

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C

25%

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D

30%

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Solution

The correct option is C 25%
Plants having genotype TtRr produce 4 different kinds of gametes.TR, Tr, tR, tr.
TtRr
↓
Gametes: TR, Tr, tR, tr
One of the four gametes carry recessive alleles for both the characters (tr).
Hence, the percentage of gametes with two recessive alleles is ¼ x 100% = 25%.

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