Ptc Genetics Lab Student Worksheet Page 8
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PTC
Analyze Your Data, continued
7. Are the DNA patterns seen in Jillian’s brother’s samples consistent with their ability to taste PTC?
8. What does seeing the DNA patterns in Jillian’s maternal grandpa’s sample tell you about her maternal grandma’s PTC
gene?
9. What percent chance of Jillian’s parents having another baby who cannot taste PTC? How about one that is like Brother
1, homozygous for the PTC taster gene? Or like Brother 2 heterozygous?
10. Based on what you have learned from this analysis, fill in as much of the family tree as you can. If you do not have the
genotype data, fill in what you can with the phenotype data.
Circle = female
Square = male
Filled shapes = non-taster
half filled = carrier
unfilled = taster
Grandpa
Grandma
Grandpa
Grandma
Uncle
Mom
Dad
Aunt
Brother 1
Jillian
Brother 2
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