Hi,

I am having a lot of trouble with this question

In peas, the allele for full pod (C) is dominant to the allele for constricted pod (c) and the allele for round seed (W) is dominant to the one for wrinkled seed (w). The two loci assort independently. A cross is made between pea plants of unknown genotypes and unknown phenotypes. The offspring have the following ratios:

3/8 full,round
3/8 full, wrinked
1/8constricted, round
1/8 constricted, wrinkled

Determine the genotype and phenotype of each parent. Show work.

I would love to help you out, lucky, but if you read our basic rules on AMHD you will find that we don't assist with homework.

Tick

Look at one thing at a time.

There are 3/8 full, round and 3/8 full wrinkled.
So? What would be the fraction representing only full (disregarding the round/wrinkled characteristic)
This becomes:

\frac38 + \frac38 = \frac68 = \frac34

Do the same with the other set, for those that are constricted.

You now get a new ratio. What sort of crossing gives this sort of ratio?

From this, you get what alleles were present in the parent genes.


After that, do the same thing for the wrinkled v/s round and get a new ratio. This would help you determine the next allele in the genes of the parent.

Post what you get! :)