What is the Mendelian ratio?

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What is the Mendelian ratio?

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Answer 1 · 2015-12-18T04:11:36

For a monohybrid cross, the phenotypic ratio is $3:1$ . This occurs because when $"Aa"$ $xx$ $"Aa"$ , the result is $1$ $"AA"$ , $2$ $"Aa"$ , and $1$ $"aa"$ .

The $"AA"$ and $2$ $"Aa"$ represent the dominant phenotype since they contain the dominant allele $"A"$ .

There is only $1$ cross that results in a recessive phenotype: $"aa"$ .

Since there are three dominant phenotypes to one recessive, the common ratio is $3:1$ .

There is also a common ratio for a dihybrid cross: $9:3:3:1$ .

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What is the Mendelian ratio?

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