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What proportion of the population is probably heterozygous (Aa) for this trait?

What proportion of the population is probably heterozygous (Aa) for this trait?-example-1
User RomanM
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The correct option is 3). 0.5. Since recessive homozygous are 25% of the total individuals, we could assume that their parents genotype was heterozygous. Only a double heterozygous cross (that is Aa -male- <> Aa -female) could produce the observed (25%) homozygous proportion. Following this assumption, the heterozygous proportion will be 50%.

User Giuseppe De Marco
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