In rats, gene B produces black coat color if the genotype is B-, but black pigment is not produced if the genotype is bb. At an independent locus, gene D produces yellow pigment if the genotype is D-, but no pigment is produced when the genotype is dd. Production of both pigments results in brown coat color. If neither pigment is produced, coat color is cream. The genotype of parents of litters with the following phenotype distribution 3 brown, 3 yellow, 1 black, 1 cream is:
a. BBDD x bbdd
b. BbDd x bbDd
c. BBdd x bbdd
d. BbDd x bbdd
Answer: b. BbDd x bbDd
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Fill in the blank(s) with correct word
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some wavelengths of light and reflect others?
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a. X-linked recessive b. X-linked dominant c. autosomal dominant d. autosomal recessive e. Y-linked
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A) Reduced ability to move the lower leg B) Decreased joint flexibility C) Decreased muscle strength D) Decreased joint stability