In a population of 400 salamanders, some individuals have long toes and others have short toes. This phenotypic difference is due to a single gene with dominant and recessive alleles, T and t, where T confers long toes. If the toe length gene is in Hardy Weinberg equilibrium, and 256 individuals have short toes, how many individuals are heterozygous at the toe length locus?

Answers

Answer 1

Solution :

Total number of salamanders or population of salamanders is given = 400

Out of theses salamanders, some have long toes while others have a short toes.

Number of individuals of salamanders having short toes = 256

The short toe individuals [tex]$(q^2) = 256/400$[/tex]

Therefore, [tex]$q=\sqrt{256/400}$[/tex]

                    = 0.8

p + q = 1

∴ p = 1 - q

     = 1 - 0.8

     = 0.2

The number of the heterozygous individuals = (2pq x 400)

                                                                          =  ( 2 x 0.2 x 0.8 ) x 400

                                                                          = 0.32 x 400

                                                                          = 128


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