Cross AABBCCDDee x aabbccddEE strains. What are the resulting genotypes and phenotypes in the first and...

Cross AABBCCDDee x aabbccddEE strains. What are the resulting genotypes and phenotypes in the first and second generations?

show the F1 genotype, then calculate the number of possible F2 genotypes so that the problem is condensed. Please and thank you!

Solutions

Expert Solution

Parental cross AABBCCDDee x aabbccddEE

Parental gametes ABCDe (From AABBCCDDee) & abcdE (From aabbccddEE)

F1 AaBbCcDdEe

So, in F1 we will get only one phenotype.

Now, two individuals of F1 will be crossed to produce F2.

F1 cross AaBbCcDdEe x AaBbCcDdEe

Now, number of heterozygous gene pairs is 5 (As A, B, C, D & E all are heterozygous at their locus).

We know that, if number of heterozygous gene pairs is n, then different types of gametes formed will be 2n & different types of genotypes produced will be 3n. Also, different types of phenotypes formed will be 2n (Assuming simple dominant-recessive relationship in each gene pair).

So, number of possible gametes formed by each F1 parent will be 25 or 32. So, number of different types of genotypes produced in F2 will be 35 or 243. Also, number of different types of phenotypes produced in F2 will be 25 or 32 (Assuming simple dominant-recessive relationship in each gene pair).

gladiator answered 1 year ago

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