Question

In pea plants P represents purple flowers while p represent white, and T represents tall plants while t represents short. Biologist cross two pea plants, each of the genotype PpTt. We would expect what phenotypic ratio from this dihybrid cross?

Answer 1

Answer: The expected phenotypic ratio is 9:3:3:1.

As per the question, purple (P) and tall (T) are the dominant traits over white (p) and short (t), which are recessive traits.

Pea plants with parental genotype PpTt will produce 4 types of gametes that is PT, Pt, pT, and pt. When the parents ( with genotype PpTt) are crossed with each other, they will produce four different types of phenotypes that is illustrated in the punnett square.

 

Answer 2

When the two pea plants will be crossed then the plants with purple colour an tall triat= 9 , white tall plants=3, puple short plants=3, and white short plants=1
So phenotype ratio will be 9:3:3:1