Question

A mouse mutation with incomplete dominance (t = tailless ) causes short tails in heterozygotes (t⁺/t).  The same mutation acts as a recessive lethal that causes homozygotes (t/t) to die in utero so they are never counted among the live mice.  Short tailed mice and long tailed mice have equal chance of surviving and reproducing.  In a population consisting of 150 mice, 60 have normal tails and 90 have short tails.

What is the average fitness of the first generation offspring of this population?

Answer 1

Fitness of the first-generation offspring of the population:

Here the survival fitness is calculated as the ratio of the survived and the total which gives 131.5 divided by 150 which gives 0.876