Biology 207 - Practice Questions 9 - Pedigree analysis
Question 1 Add genotypes to the pedigrees from the Open Genetics text that I used in my
lecture: Figure 5.6 (AR), Figure 5.3 (AD), Figure 5.9 (XR), and Figure 5.4B (XD). Use a for the
recessive allele and A for the dominant allele (like I was doing in class).
Question 2 Vegetables such as broccoli contain phenylthiocarbamide. Some people find PTC
to be unpleasantly bitter while other people can't taste it at all. The ability to taste is due to a
person's genotype at the TAS2R38 gene at 7q35.
a) Tasting is dominant to non-tasting. Why?
(This question is based upon a question in Griffiths et al.) A taster woman with a non-taster
father marries a