Question

4. If you can taste the chemical PTC, it means you have at least one copy of a dominant gene for (that will be C). If you can't taste it, you have two copies of the recessive allele for tasting PTC- (that will be c) therefore making a non-taster's genotype cc). A man who can taste PTC marries a woman who can also taste PTC. Both partners each have one parent who cannot taste PTC and one who can. If this happy couple plans to have 8 children, about how many of their children do you predict will be able to taste PTC? Hint; to deduce the man's genotype, consider his phenotype (taster) as well as his parents genotype (one was a non-taster and you will know what type of genotype that creates.)

a) What is the man's genotype? Please explain your answer.

b) What is the woman's genotype? Please explain your answer

c) Create a Punnett Square

d) What is the phenotypic ratio of the children?

e) About how many out of the eight will be expected to taste PTC?

5. Let's imagine that in humans high blood pressure is due to a dominant gene P and that normal blood pressure is associated with the recessive allele p (homozygous recessive creates normal pressure). A man suffers from high blood pressure, as did his father. He has a sister and a brother with normal blood pressure, and his mother also has normal blood pressure. He plans to marry a woman who is heterozygous with regard to these genes. If they have 4 children together, please estimate how many of their children will have high blood pressure.

a) What is the man's genotype? Please explain your answer

b) What is the woman's genotype? Please explain your answer

c) Create a Punnett square

d) What is the phenotypic ratio of the children?

e) About how many out of four will be expected to have high blood pressure?

Answer 1

Answer.