Consider the following pathway to produce chemical X in mice. Lack of chemical X
ID: 11056 • Letter: C
Question
Consider the following pathway to produce chemical X in mice. Lack of chemical X causes mice to lose their fear of cats(hence it is a very rare condition). It is discovered that the genes for enzymes Q and R are on the same chromosome and are separated by 8 map units.
chemical Q ----enzyme Qase----> chemical R----enzyme Rase----> chemical X
A colony of mice that lack chemical X is located. These mice have the genotype qq rr. One of these mice is mated to a fully wild type mouse. The offspring of this mating are Qq Rr and make chemical X. One of these Qq Rr mice is mated with a fully recessive qq rr mouse. What is the probablility that the first offspring mouse of this mating will suffer from a lack of chemical X?
I tried the problem and the answer is not 3/4. Thank you for any help!
Explanation / Answer
answer : 8 %
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Qq Rr x qq rr
Q R
Qr
q R
q r