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Problem: In shorthorn cattle, coat color may be red (RR), white (rr), or roan (Rr). Roan is a phenotype expressed as a mixture of red and white hairs. What mode of inheritance is coat color in short horn cattle?If you cross roan cows together to produce 12 calves. how many of each phenotype do you expect?

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Following Mendelian Genetics, the offspring would always look like one of the two parental varieties. This is due to one allele, having complete dominance over the other. This results in heterozygotes having the same phenotype as the homozygous dominants. 

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In shorthorn cattle, coat color may be red (RR), white (rr), or roan (Rr). Roan is a phenotype expressed as a mixture of red and white hairs. What mode of inheritance is coat color in short horn cattle?

If you cross roan cows together to produce 12 calves. how many of each phenotype do you expect?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Extensions to Mendel concept. You can view video lessons to learn Extensions to Mendel. Or if you need more Extensions to Mendel practice, you can also practice Extensions to Mendel practice problems.

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Based on our data, we think this problem is relevant for Professor Ganguly-Fitzgerald's class at SANDIEGO.