Question

the offspring of a particular cross are 100 percent heterozygous for the trait of plant height. what were the most likely genotypes of the parents? o tt × tt o tt × tt o tt × tt o tt × tt

Explanation:

Step1: Recall heterozygous definition

A heterozygous genotype has two different alleles. For plant - height trait with alleles T (tall) and t (short), heterozygous is Tt.

Step2: Analyze each cross

• For TT×tt: All offspring will be Tt (heterozygous).
• For tt×tt: All offspring will be tt (homozygous recessive).
• For Tt×Tt: Offspring genotypes will be TT : Tt : tt in a 1:2:1 ratio, so not all are heterozygous.
• For Tt×tt: Offspring genotypes will be Tt : tt in a 1:1 ratio, so not all are heterozygous.

Answer:

TT×tt