MCB 2400 Human Genetics Mendel Quiz 9 v2 The olfactory receptor gene OR6A2 plays
ID: 3164349 • Letter: M
Question
MCB 2400 Human Genetics Mendel Quiz 9 v2 The olfactory receptor gene OR6A2 plays a large role in determining whether individuals like the taste of cilantro or not. The dominant 02A allele gives cilantro an unpleasant 'soapy taste, while the recessive 02 allele cannot detect the soapy taste of cilantro. Alex has never tried cilantro before, but he had always listened to both his parents complain about how much they hate the taste of it. To his surprise, when Alex bit into his over-cilantroed Moe's burrito it ws delicious! 1. What is Alex's genotype for the OR6A2 gene? 2. How is Alex's phenotype possible? How can an individual like the taste of cilantro when both of their parents genetically, dislike the taste of it?S s 3. What is the probability that Alex's parenis had a child who enjoyed cilantro? (show all work for full credit er e asparagus urine trait is autosomal dominant with the smelly allele (R) dominant over the non-smelly 4. Th allele (r) Alex has smelly asparagus urine and is a heterozygote for this trait. Alex has a child with a woman who is a heterozygote for disliking cilantro and homozygous for producing smelly urine after eating asparagus. a. Write Alex's genotype for both traits:00 b. Write the woman's genotype for both traits: c. What is the probability that Alex's child hates cilantro and has smelly asparagus urine? shong all work for ful credit!) d. What is the probability that Alex's child likes cilantro and does not have asparagus urine? (show all work for full credit)Explanation / Answer
3.
O2A = Dominant allele
O2G = Recessive allele
Alex's parents do not like the taste of cilantro. So, they must contain at least one copy of the O2A allele.
Alex himself likes the taste of cilantro. So, he must be homozygous for O2G.
This is possible only when Alex's parents are heterozygous.
Parental cross: O2AO2G X O2AO2G
Progeny: O2AO2A O2AO2G O2AO2G O2GO2G
Genotypic ratio = 1:2:1
Phenotypic ratio = 3(don't like): 1 (like)
The probability for the progeny to like the taste of cilantro = 1/4
4.
a. Alex = Rr O2GO2G
b. Wife = RR O2AO2G
c. 1/2
d. 0
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