Maple syrup urine disease is an autosomal recessive gene.  The R allele leads to a normal protein product, whereas r leads to a mutant protein.  Which genotype below will display the Maple syrup urine disease phenotype?   A. Rr   B. RR   C. rr   D. Rr and rr

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Chapter20: Make Room For The Ruminants
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Maple syrup urine disease is an autosomal recessive gene.  The R allele leads to a normal protein product, whereas r leads to a mutant protein.  Which genotype below will display the Maple syrup urine disease phenotype?

  A.

Rr

  B.

RR

  C.

rr

  D.

Rr and rr

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