Question

In pea plants, the allele for tall plants is dominant to the allele for short plants. If a homozygous tall plant is crossed with a homozygous short plant, what percent of offspring would you expect to be short? (2 points)

Answer 1

Heterozygous pea plant would have two kinds of gametes: T and t. Homozygous pea plant would have only one kind of gamete: T. Based on punnet square, all F1 progeny would be either TT or Tt for their genotype.         T   l   tT     TT  l  Tt T     TT  l  Tt I have made punnet square for your easy comprehension.  Since T is dominant over  t, all F1 progeny will be tall, that is 100% tall in phenotype. 50% of this progeny would be homozygous tall and rest 50% would be heterozygous tall. Hope this helps.