Q.

Calculate the number of genotypes possible for a character controlled by 4 alleles

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a

6

b

10

c

5

d

4

answer is B.

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Detailed Solution

If a gene has 4 alleles, then this is an example of multiple allelism. To calculate the number of genotypes in multiple allelism we use the formula n2(n+1). In this case the genotypes will be 42(4+1)= 10.
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