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  4. An individual heterozygous for two alleles AaBb produces two million sperms. How many of the sperms will have both the recessive alleles?

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Q. An individual heterozygous for two alleles AaBb produces two million sperms. How many of the sperms will have both the recessive alleles?

NTA AbhyasNTA Abhyas 2022

Solution:

A dihybrid AaBb will produce four types of gametes AB, Ab, aB, ab. All the gametes will be produced in equal proportion. Thus, $\text{0.5 million}$ gametes will have ab genotype.