Question

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?

Answer 1

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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