Dihybrid cross 1. If you have P generation where one parent is homozygous domina

Question

Dihybrid cross

1. If you have P generation where one parent is homozygous dominant for both traits and the other parent is homozygous recessive for both traits, what will the F1 genotypes be?

2. If you then cross F1 x F1, what will the F2 genotypes be? Assuming that the trait is one of “complete dominance”, what will be the F2 frequency of offspring with 1) both dominant traits, 2) one trait dominant and one trait recessive, 3) one trait recessive and one trait dominant (swapped from number 2), and both traits recessive?

Explanation / Answer

1. RrFf - F1 genotypes

2. RRFF, RrFF, RRFf, RrFf, RrFF, rrFF, RrFf, rrFf, RRFf, RrFf, RRff, Rrff, RrFf, rrFf, Rrff, rrff.

3. 1 - both dominant traits,

4. 3 - one recessive and one dominant

5. 3 - One dominant trait and one recessive trait

6. 9 - both trait recessive

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