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Skin color in a fish is inherited via a single gene with four different alleles. How many different genotypes would be possible in this system?

Question

Skin color in a fish is inherited via a single gene with four different alleles. How many different genotypes would be possible in this system?

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Solution

The number of genotypes possible in a system with multiple alleles can be calculated using the formula n(n+1)/2, where n is the number of alleles.

In this case, the fish has 4 different alleles for skin color.

So, substituting 4 into the formula, we get:

4(4+1)/2 = 4*5/2 = 20/2 = 10

Therefore, there would be 10 different genotypes possible in this system.

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