Extensions to Mendel Video Lessons

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Problem: In cattle, the allele producing red coat color (R) is incompletely dominant over the allele (r) for white coat color. Heterozygotes (Rr) are roan colored. Cattle homozygous for a different gene, "short spine" (aa), are deformed and die shortly after birth. Heterozygous carriers (Aa) are completely normal. If a series of matings is conducted between Aa roan animals, what will be the phenotypic ratio:a) at birth?b) several days after birth?

FREE Expert Solution

This is a series of matings for Aa roan (Rr) cattle. Thus, this is a dihybrid cross problem, AaRr x AaRr.

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Problem Details

In cattle, the allele producing red coat color (R) is incompletely dominant over the allele (r) for white coat color. Heterozygotes (Rr) are roan colored. Cattle homozygous for a different gene, "short spine" (aa), are deformed and die shortly after birth. Heterozygous carriers (Aa) are completely normal. If a series of matings is conducted between Aa roan animals, what will be the phenotypic ratio:

a) at birth?

b) several days after birth?

Frequently Asked Questions

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 Yeargain's class at UCF.