Two People (Both Heterozygotes)are Able to Taste a Chemical Substance

question 33

Multiple Choice

Two people (both heterozygotes) are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T) . The inability to taste PTC is caused by a recessive allele (t) . What proportion of their children would be expected to have the tt genotype?

• A)3/4
• B)1/2
• C)All
• D)1/4
• E)2/3

---

Definitions:

Newman Projection

A method of depicting the three-dimensional structure of molecules by looking down the length of one of the bonds to better understand spatial relationships.

C3-C4

This term could refer to a variety of contexts; however, it often relates to the transition between the third and fourth carbon atoms in a molecular structure, possibly indicating a bond or functional group location.

Substituents

Atoms or groups of atoms that are substituted or replaced in the molecule of an organic compound, affecting its properties and reactions.

Axial Position

A spatial location in a molecule where substituents are perpendicular to the plane of a ring, such as in cyclohexane.