What is the ratio of heterozygous offspring to total offspring in the punnett square

there is no such thing as an 'offspring'

Offspring are the babies of any animal. For example, kittens are a cat's offspring.

1. The rabbit had a litter of seven cute offspring.
2. The scientist studied the behavior of the offspring in the wild.
3. The offspring inherited their parents' genetic traits.
4. The zoo celebrated the birth of a rare species' offspring.

The Offspring was created in 1986.