Question: 2. The ADH gene also has two primary alleles. One allele, A, codes for a form of the ADH
enzyme that catalyzes the conversion of alcohol into acetaldehyde approximately 80 times
faster than the form encoded by the a allele. AA individuals exhibit fast conversion, Aa
individuals exhibit medium conversion, and aa individuals exhibit slow conversion of alcohol
into acetaldehyde. In this question, we are interested in “conversion rate” as a trait. The
possible phenotypes are fast, medium, and slow.
a. Does the ADH gene exhibit dominance, incomplete dominance, or codominance with
respect to the alcohol conversion rate? Explain your answer.
b. Jasmine and Jake both exhibit a medium rate of conversion of alcohol into
acetaldehyde. What proportion of their kids are expected to exhibit fast conversion,
medium conversion, or slow conversion of alcohol? Show your work with a Punnett
square and explain.
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