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Question

Which one of the following genotypes can form only two different types of gametes?

A
AaBbccDd
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B
AaBbccDDEe
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C
AABbCCddEE
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D
AaBbCcDDEe
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Solution

The correct option is C AABbCCddEE
Formula to calculate how many different types of gametes can be formed is 2n, where n is the number of heterozygous genes/ allele pairs.
The AABbCCddEE genotype has one heterozygous gene pair of Bb, hence it will form 2 types of gametes, ABCdE and AbCdE.
AABbCCddEE produces only 2 types of gametes as shown below:
AABbCCddEE

ABCdE & AbCdE
AaBbccDd forms 23 = 8 kinds of gametes.
AaBbccDDEe forms 23 = 8 kinds of gametes.
AaBbCcDDEe forms 24 = 16 kinds of gametes.

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