0.81
Explanation:
The frequency of all alleles of a gene, according to Hardy Weinberg principle, should add up to 1. This is demonstrated by the formula below for diploid organisms;
p + q = 1
If p = 0.19; then ..
0.19 + q = 1
q = 1 - 0.19
= 0.81
Learn More:
For more on allelic frequencies check out;
https://brainly.com/question/12315129
https://brainly.com/question/9916141
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