In pea plants, tallness (t) is dominant to shortness (t). what are the predicted percentages of the genotypes of the offspring if a homozygous short plant is crossed with a heterozygous tall plant?

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28-06-2022
Biology

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In pea plants, tallness (t) is dominant to shortness (t). what are the predicted percentages of the genotypes of the offspring if a homozygous short plant is crossed with a heterozygous tall plant?

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Tutorconsortium326 Tutorconsortium326 · Answer 1 · 2022-06-29T05:57:03+02:00

If a homozygous short plant (tt) is crossed with a heterozygous tall plant (Tt), the percentage of tall offsprings is 50% and the percentage of short offspring is 50%.

A heterozygous tall pea plant will have the genotype "Tt" and a homozygous short pea plant will have the genotype "tt" because homozygous means that both alleles are identical.

Since 'T' is dominant over 't', any plant with at least one "T" allele will be tall (the dominant trait), regardless of what the other allele is.

The punett square of the following problem will have 2 squares with Tt genotype and 2 squares with tt genotype.

Hence, the genotypic ratio of F1 generation will be

Tt : tt

1 : 1

And phenotypic ratio of F1 generation will be

Tall : Short

1 : 1

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