Question

which punnett square shows a cross between a heterozygous tall (tt) plant and a homozygous short (tt) pea plant? a.

tt	tt
tt	tt

c.

tt	tt
tt	tt

b.

tt	tt
tt	tt

d.

tt	tt
tt	tt

a a
b b
c c
d d

Explanation:

Step1: Identify parental gametes

The heterozygous tall plant (Tt) can produce two types of gametes: T and t. The homozygous short plant (tt) can only produce t - type gametes.

Step2: Construct Punnett - square

When we set up the Punnett - square, we put the gametes of one parent along the top and the gametes of the other parent along the side. For the cross between Tt and tt, when we combine the gametes, we get the following combinations: T from the first parent and t from the second parent gives Tt; t from the first parent and t from the second parent gives tt. Repeating this for all combinations in the 2x2 Punnett - square, we have two Tt and two tt combinations, which is shown in option C.

Answer:

C. Tt, tt; Tt, tt