Question

Show a dihybrid cross between a plant that is heterozygous tall and heterozygous round with a plant that is homozygous dominant tall and wrinkled. Tall (T) is dominant over short (t) and round (R) is dominant over wrinkled (r).
(Show the cross and explanation too please :)). )

Answer 1

A dihybrid cross tracks 2 genetic traits from 2 parents.

First you need to look at all the potential combinations of each parent

Parent 1: heterozygous tall & heterozygous round Tt & Rr

Parent 2: Homozygous dominant tall & wrinkled TT & rr

(use something like foil and look at all the possible options)

Parent 1:  TR , tR,  Tr, or tr

Parent 2: Tr

            TR .           tR .          Tr            tr

Tr .      TT Rr .        Tt Rr .      TT rr       Tt rr

Results show that 50% of offspring will be Tall & Round and 50% will be tall and wrinkled (phenotype)

however genotype displays a 1:1:1:1 ratio as none of the genotypes are exactly the same