Question

For plant stem length, the dominant allele for height is T and the recessive allele is t. If a heterozygous parent for tall stem length crossed with a homozygous recessive parent for short stem length, what would be the phenotypes of the offspring? Include the probability percentages or fractions in your answer.

Answer 1

Most likely the offspring would be short stem. One parent has a dominant allele for long stem and a recessive allele for short stem and the other has two recessive short stem alleles, making the percentages 25% for tall stem and 75% chance of being a short stem plant.

Answer 2

For a plant stem and a domain allele, the height is set to T and the excessive allele is t. If the tall plant is means that the allele for T and t is 50% short and 50% small.

Hence the offspring would be the short stem.

• The hetero parent for the tall (Tt) is crossed with a parent recessive  (tt)

• The percentages are 25% for the tall stem and the 75% chance for a short stem plant.

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