If a genotypic ratio of 1:2:1 is observed, what must the genotypes of both parents be?

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2007-01-04 09:39:58 · 3 answers · asked by 000123 2 in Science & Mathematics ➔ Biology

The parents are both heterozygous, which gives a standard genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1 in the F2 generation.

2007-01-04 09:46:56 · answer #1 · answered by ivorytowerboy 5 · 0⤊ 0⤋

The parents are both heterogeneous, which gives a standard genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1 in the crossed generation.

2007-01-04 17:44:41 · answer #2 · answered by Erin M 3 · 0⤊ 0⤋

both parents are heterozygous. i.e. Aa * Aa
so you get AA : Aa : aa = 1:2:1

2007-01-04 17:46:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋