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When breeding different combinations of genotypes for Scrapie Susceptibility Resistance, your probabilities are as follows:

When breeding an RR to another RR: All lambs will be RR.

When breeding an RR to a QR: Each lamb has a 50% chance of being RR
And a 50% chance of being a QR
And a 0% chance of being QQ

When breeding an RR to a QQ: Each lamb has a 100% chance of being a QR
0% chance of being a RR
0% chance of being a QQ

When breeding a QR to a QR: Each lamb has a 50% chance of being a QR
And a 25% chance of being an RR
And a 25% chance of being a QQ

When breeding a QQ to a QQ: All lambs will be QQ

When breeding a QQ to a QR: Each lamb has a 50% chance of being a QR
And a 50% chance of being a QQ
And a 0% chance of being a RR

 

 

 

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