84%
84% of the population of mice would be heterozygous.
Heterozygous refers to the presence of two different allele types for the same gene. For a single gene, these alleles display two distinct character types. An illustration would be someone with an allele for both brown and black hair.
There are 200 mice in total, 168 of which are brown.
By the Hardy–Weinberg (HW) equilibrium
q² (bb) = (200 - 168) /200 = 32 / 200 = 0.16
q: √ 0.16 = 0.4
p = 1 - q = 1 - 0.4 = 0.6
p² (BB) = 0.6 x 0.6 = 0.36
Thus, 84% of the population of mice would be heterozygous.
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