The gene for tallness (T) in a pea plant is dominant over the gene for shortness (t). In a cross between two heterozygous parent pea plants, we can predict that what percentage of the offspring will be tall?
A-100%
B-50%
C-25%
D-75%
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75% ......
Tt × Tt
TT , Tt , Tt , tt
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The percentage of tall offsprings would be- D-75%
- When two heterozygous pea plants are crossed, the progeny produced will have a genotypic ratio- 1:2:1. This means, out of 100%, 25% offspring will have a genotype TT, 50% will have genotype Tt and 25% will have genotype tt.
- However, the phenotypic ratio in the resultant progeny will be 3:1 i.e. out of 100%, 75% offsprings will be tall and 25% will be short. This is because, in heterozygous conditions, the gene having tall trait will be expressed as it is a dominant trait.
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