Question

Completing a Punnett Square

Suppose you are tutoring a classmate on how to complete a Punnett square.

How would you explain to a classmate the process of using a Punnett square for a cross between one pea plant with genotype Tt and a second pea plant with genotype Tt, where T is the allele for a tall pea plant, and t is the allele for a short pea plant? Make sure to describe how you would find the probability that a given offspring of the two parents is tall or short.

Answer 1

wow long time since I've done this but I believe the answer would be... Since T is the dominant gene that would mean being tall is a dominant gene. well one of the parents of the plants have to tt and one would have to be TT for all of the offspring to have the genes Tt. So to find if the pea plants will be tall or short all you have to do is take each of the parents genes and combines them. If there is a T in any of the answers that means that they offspring has a dominant gene off being tall. As for the outlook of what the offspring will be they will all be Tt.

(In the picture it shows your question just with different letters.)

Hint: The father gene is always on the top and the mother gene is on the left hand side.