In Dogs,there Is a Hereditary Deafness Caused by a Recessive

question 55

Multiple Choice

In dogs,there is a hereditary deafness caused by a recessive allele,d.A kennel owner has a male dog that she wants to use for breeding purposes if possible.The dog can hear,but the owner is unsure of the genotype.She does a testcross (crosses it to a homozygous recessive dog) ,and two of the five offspring are deaf.This means that the male dog

• A)has the genotype Dd
• B)has the genotype DD
• C)has the genotype dd
• D)is actually deaf
• E)is still of unknown genotype since there were offspring of both deaf and hearing phenotypes

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