For the trait "height of a plant" coded by an autosomal gene with a dominant allele "T" that codes for a tall plant and a recessive allele "t" that codes for a short plant.
You have to complete the Punnet square for the crossing of a homozygous dominant plant "TT" and a homozygous recessive plant "tt"
On the margins of the table, you have to write the alleles that each parent will inherit to its offspring.
In this case, both parents are homozygous, which means that they only will inherit one type of allele.
The gametes of the tall plant will only have the allele dominant "T" and the gametes of the short plant will only have the recessive allele "t".
Complete the margins of the table:
The next step to completing the Punnet square is to cross each row and column to determine the genotypes of the offspring:
The offspring of this cross will inherit one dominant allele "T" from one of the parental plants and one recessive allele "t" from the other parental plant. All resulting offspring will be heterozygous for this trait.
The genotype will be Tt.
The inheritance of this trait follows a recessive pattern, which means that the phenotype "short" will only be expressed by plants carrying two recessive alleles "tt" (homozygous recessive), while the phenotype "tall" will be expressed by plants with at least one dominant allele "T", which are the homozygous dominant "TT" and the heterozygous "Tt".
All the offspring will be heterozygous, which means that their phenotype will be "Tall"