Question

both phenotypic ratio and genotypic ratio of F2 are same in
a) Co-dominance
b) Incomplete dominance
c) Out cross
d) More than one is correct.

Answer 1

Here is your answer -

Your answer is option (d) More than one is correct.

- In Co-dominance and Incomplete dominance both phenotypic and genotypic ratio are same.

a.) Co-dominance - When in a cross between two individuals having opposite contrasting characters formed progeny does not show blending of characters and both characters expressed equally then such type of cross is known as Co-dominance. e.g; - coat colour of animals.

[Please check the attached to understand better]

b.) Incomplete dominance - In incomplete dominance, after cross both dominant and recessive factors are present but dominant factors are unable to express it's character completely due to which an intermediate character appears. e.g; - Flower colour in Mirabilis jalapa.

[ please check the attachment to understand better ]

c.) Out Cross - When any individual from F1 generation crossed with dominant parent then such type of cross is known as Out Cross.

[ Please check the attachment to understand better]

Thanks !!!

Answer 2

Both phenotypic ratio and genotypic ratio of F2 are same in b) Incomplete dominance

A cross between organisms with two different traits creates offspring with a third phenotype that combines the parental features in incomplete dominance.

Incomplete dominance allows heterozygous individuals to blend their characteristics.

Consider a snap dragon flower ,when a cross between  a red and a white flower occurs all of the flowers in the F 1 generation will be pink (R1 R2). We get one red (R1 R1) flower, two pink (R1 R2) flowers, and one white (R2 R2) flower when the F 1 generation is self-pollinated. In the F 2 generation, the ratio for incomplete dominance is 1:2:1 for both genotype and phenotype.

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