Question

A heterozygous tall pea plant is crossed with a short plant. The probability than an F1 plant will be tall is(1point)

Answer 1

Heterozygous tall pea plant: Tt
Short plant: tt

Make a Punnett square:

T t
t Tt tt
t Tt tt

So, the only possibility that will give a tall plant in this case is Tt, and there is 50% chance of an F1 plant having this genotype and phenotype.