Question

A population of crawfish lives in an isolated pond. You would like to determine the level of inbreeding in this population. You measure allele frequencies at a particular locus. This locus has two alleles, D and d. You determine that the observed frequency of the D allele is 0.15. If the observed frequency of heterozygotes (Dd) is 0.45 in this population, then what is the inbreeding coefficient?

Group of answer choices

a)1.235

B)0.124

C)0.216

D)0.050

Answer 1

Inbreeding coefficient =

where, He = Expected heterozygosity

Ho = Observed heterozygosity

Here, Ho = 0.45

We have to first calculate He.

The frequency of D allele, p^2 = 0.15

So, p = √ 0.15 = 0.387

Then q = 1 - p

q = 1 - 0.38 = 0.613

He = 2pq = 2 × 0.387 × 0.613 = 0.474

Now, Inbreeding coefficient =

=

= 0.050

Thus the correct answer is (d) 0.050