Question

a purebreeding tall plant with white flowers is crossed with a heterozygous tall, purple plant. what is the probability that you will get a tall, white plant? T=Tall t=Short P=Purple p=white

Answer 1

Assuming the purebreeding tall white is TT pp and the heterozygous tall purple is Tt Pp:

- Parent genotypes: TT pp × Tt Pp
- Gametes: TTpp parent → Tp only; TtPp parent → TP, Tp, tP, tp (each 1/4)
- Offspring from Tp × (TP, Tp, tP, tp):
- TT Pp (tall, purple)
- TT pp (tall, white)
- Tt Pp (tall, purple)
- Tt pp (tall, white)

2 of 4 outcomes are tall white → probability = 2/4 = 1/2 = 50%.

(If by “heterozygous tall, purple” you meant heterozygous only for height but homozygous purple (Tt PP), then no white offspring would be produced.)