A Tt plant crossed with a Tt plant will have a 25% chance of having a tt offspring each time they reproduce.

a. True

b. False

The answer is a. True.

If two heterozygous (Tt) cross, there is a 25% percent chance of having a TT offspring, a 25% chance of having a tt offspring, and a 50% chance of having a Tt offspring:

Parents: Tt x Tt

Offspring: TT Tt Tt tt

So, a chance of having the tt offspring is 1 of 4, which is 1/4, which is 25%.