Question

The results of a test cross of a tall tomato plant was 100% tall. Fill in the punnett square if all the recessive alleles (genes) came from pollen during the cross test.

Answer 1

TT (female parent)= All gametes with "T" allele

tt (male parent)= All gametes with "t" allele

Step-by-step explanation:

Let's assume that the allele "T" is responsible for the tallness and the allele "t" makes the plants dwarf.

Since the progeny of the test cross was tall only, this means that only the dominant trait was expressed. When a test cross progeny expresses only the dominant trait, the dominant parent is homozygous dominant for the gene. Since all the recessive alleles came from the pollen, the dominant parent imparted the "T" allele to the progeny. The genotype of the female parent was "TT" and that of the male parent was "tt".