In pea plants, two stem lengths are possible: tall (T) and dwarf (t). Tall is dominant to dwarf. a. In a purebred tall plant, what gametes are possible? b. In a purebred dwarf plant, what gametes are possible? c. What is the genotype of a purebred tall plant? d. What is the genotype of a purebred dwarf plant?

a. only T gametes

b. only t gametes

c. TT

d. tt

Explanation:

This question involves a single gene coding for stem length in pea plant. The allele for tall stem length (T) is dominant to dwarf stem length (t).

- A purebred is an organism that will only transfer one type of phenotype to its offspring or produce only one type of GAMETE. Hence, to do this, a purebred must have a homzygous genotype. According to this question;

a. A purebred tall plant (TT) will produce only 'T' gametes.

b. A purebred dwarf plant (tt) will produce only 't' gametes.

c. The genotype of a purebred tall plant will be 'TT'

d. The genotype of a purebred dwarf plant will be 'tt'

the correct answer is d