Question

when plant with genotype AaBb is selfed what would be the phenotype ratio when 1st Gene is completely dominant 2 nd Gene is incompletely dominant
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Answer 1

Answer:

ANSWER

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'.

Answer 2

$\huge\boxed{\underline{\mathcal{\red{❥A}\green{N}\pink{S}\orange{W}\blue{E}\purple{R}}}}$

Hence, in each case of incomplete domination, the heterozygous condition will result in a new phenotype.

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'.