How do you figure the percentage of offspring that will be a carrier of an Autosomal Recessive gene when the FATHER is the recessive carrier and the MOTHER is not affected (normal, no recessive)? Thank you for your assistance.


Do your cross diagram and multiply the correct combinations together:

Father: Rr

Mother: RR

Since it's autosomal:

Chance of getting R from father: 50%

Chance of getting r from father: 50%

Chance of getting R from mother: 100%

You're looking for the chance of receiving Rr, which requires r from the father and R from the mother.


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