Question

In a dihybrid cross between RrTt and RRtt, what are the genotype and phenotype ratios of the offspring, assuming R and T are dominant? R codes for round seed, while r codes for wrinkled seed. T codes for tall height, while t codes for short height. (Show your Punnett Square). Please help me I can not figure it out I am in need indeed

Answer 1

9:3:3:1

Answer 2

The first step in a dihybrid cross is to figure out what possible combinations of genotypes each parent passes on to the offspring.

For example, look at just the parent who has the genoytpe RrTt. The parent has four different chromosomes and each of those chromosomes has on it one single allele or gene copy. The first chromosome has a single R allele, the second has an r allele, the third has a T allele and the fourth has a t allele.

Any one of those four chromosomes could end up being passed on to any given offspring - subject to the constraint that the offspring will get one chromosome with the R or r allele and one chromosome with a T or t allele.

So for the first parent, the possible combinations of chromosomes it could pass on to any single individual child will be RT, Rt, rT and rt.

If that's clear, do the same for the second parent...

Answer 3

sorry i lost the internet connection can you help me with punnettt square