Right, or it could also be reduced to a 1 Tt : 1 tt ratio
Ready to go on?
Problem #3
So far we have been working with only one trait or a monohybrid cross. There have been two possibilities (tall or short), but it is only one trait (height). Now we are going to work with 2 traits - height and color of the peas. The trick to dihybrid crosses (two traits) is that you have to keep a height gamete (tall or short) with a color gamete (yellow or green) at all times.
We are going to cross a homozygous tall yellow plant with a short green plant.
___________ x _______________
What is the genotype of the homozygous tall yellow plant? ________
Well, let's break it down a little further.
What is the genotype of the homozygous tall part?
a. TT
b. Tt
c. tt
d. YY