Which statement about Mary and Jeanne's genotype is correct?

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11. The following diagram shows parts of the male reproductive system. Which part is cut during a vasectomy?

A vasectomy is a surgical procedure for male sterilization. It involves cutting or sealing the tubes that carry sperm from the testes to the urethra.

A points to the vas deferens (also called the sperm duct). This is the tube that is cut during a vasectomy.
B points to the urinary bladder.
C points to the urethra.
D points to the testis.

The correct part cut during a vasectomy is A.
$\boxed{\text{A}}$

12. The diagram shows a family tree and the ability to taste a certain substance. The allele for the ability to taste the substance is dominant. Which statement about Mary and Jeanne's genotype is correct?

Let 'T' be the dominant allele for tasting and 't' be the recessive allele for not tasting.

A person who cannot taste must have the genotype tt.
A person who can taste can have the genotype TT or Tt.

Determine the genotype of individuals who cannot taste.
- Mary's child (2nd generation, male, shaded square) cannot taste, so his genotype is tt.
- Jeanne's child (2nd generation, female, white circle) cannot taste, so her genotype is tt.
Determine Mary's genotype.
- Mary (1st generation, female, shaded circle) can taste, so her phenotype is T_.
- Since Mary has a child with genotype tt, she must have passed on a 't' allele to her child.
- Therefore, Mary's genotype must be Tt (heterozygous).
Determine Jeanne's genotype.
- Jeanne (1st generation, female, shaded circle) can taste, so her phenotype is T_.
- Since Jeanne has a child with genotype tt, she must have passed on a 't' allele to her child.
- Therefore, Jeanne's genotype must be Tt (heterozygous).
Compare the genotypes with the given options.
Both Mary and Jeanne are heterozygous.

The correct option is C.
$\boxed{\text{C. They are both heterozygous}}$

Which statement about Mary and Jeanne's genotype is correct?

Answer

Step-by-step solution

Determine the genotype of individuals who cannot taste.

Determine Mary's genotype.

Determine Jeanne's genotype.

Compare the genotypes with the given options.

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