If the two sunflowers produced 20 offspring, calculate how many would be likely to have the genotype Tt. 5101520I'm not sure

To answer this question, we need to know the genotypes of the parent sunflowers. However, if we assume that the parent sunflowers are both Tt (heterozygous), we can use a Punnett square to predict the genotypes of the offspring.

A Punnett square for this cross would look like this:

   T    t
-------------

T | TT Tt ------------- t | Tt tt

From this, we can see that the ratio of TT : Tt : tt is 1:2:1. This means that for every 4 offspring, we expect 1 to be TT, 2 to be Tt, and 1 to be tt.

If the two sunflowers produced 20 offspring, we would expect about half of them, or 10, to have the genotype Tt. This is because Tt appears twice in the 4 possible outcomes, making it twice as likely as either TT or tt.