Question: In a certain flower, two genes control flower color (A & B).
You cross a true breeding purple…


In a certain flower, two genes control flower color (A & B).
You cross a true breeding purple parent with a true breeding blue
parent to get an all purple F1. You then self the F1 and get 60
purple flowers, 15 blue flowers & 5 white flowers. Show the
genotypes of the F2 and the original parents. What kind of gene
interaction is this?

In a certain bean, two genes control seed color (A & B). You
cross a true breeding white parent and a true breeding green parent
to get an all green F1. You then self the F1 and get 45 green
offspring, 15 yellow offspring, 15 purple offspring and 5 white
offspring. Show the genotypes of the F2 and the original parents.
What kind of gene interaction is this? the answer should be 9:3:3:1
, No epistasis.( show steps)

In certain flowers, P= purple and p = white. Purple is
completely dominant to white, but is only 70% penetrant. What
phenotypic ratios do you expect in the F2 if your parental cross is
PP x pp (out of 100 offspring)?

You cross two yellow mice and find that ⅔ of the offspring are
yellow, and ⅓ are agouti. If you breed agouti mice, you get 100%
agouti offspring but you are never able to obtain a pure breeding
yellow line. Why is this? Show the crosses that support your
answer.

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