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The dihybrid phenotypic ratio
when dominance is incomplete
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Answer ⤵️⤵️
This dihybrid cross shows the typical 9:3:3:1 phenotypic ratio expected when the traits both show complete dominance and are independent of each other.
Incomplete dominance is the condition where a dominant trait fails to show dominance completely in the heterozygous condition. For example, in snapdragon homozygous dominant results in the red color of the flower while homozygous recessive results in white flower. While heterozygous condition results in the pink color of the flower.
Hence, in each case of incomplete domination, the heterozygous condition will result in a new phenotype.
Following Punnet's square is representing dihybrid cross for genes A and B showing incomplete domination -
AB Ab aB ab
AB AABB AABb AaBB AaBb
Ab AABb AAbb AaBb Aabb
aB AaBB AaBb aaBB aaBb
ab AaBb Aabb aaBb aabb
As we can see by counting phenotype ratio is same as genotype ratio here i.e. 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1.
So, the correct option is '1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1'.
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