Question

An F1 plant that is homozygous for shortness is crossed with a heterozygous F1 plant. What is the probability that a seed from the cross will produce a tall plant? use a Punnett square to explain your answer and to compare the probable variations in the F2 plants.

Answer 1

Answer:

1/2 or 50%

Explanation:

Let's assume that the allele "T" gives a "tall" phenotype while the allele "t" gives a "short" phenotype to the plants. The genotype of the homozygous short plants would be "tt". The genotype of the F1 heterozygous tall plant would be "Tt". A cross between "Tt" and "tt" would give progeny in following ratio=

Tt x tt = 1/2 tall (Tt): 1/2 short (tt)

Therefore, there is 1/2 or 50% chance that the seeds from the given cross produce a tall plant.