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

question 73

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 ability to taste PTC?

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

---

Definitions:

Vesicles

Small membrane-bound sacs in cells used for the transport, storage, and digestion of substances.

Electron Microscope

A type of microscope that uses a beam of electrons to create an image of the specimen with much higher resolution than a light microscope.

Selectively Permeable Membrane

A membrane that allows certain molecules or ions to pass through it by diffusion and occasionally specialized processes, crucial in maintaining the cell environment.

Osmosis

The movement of water molecules through a selectively permeable membrane from a region of lower solute concentration to one of higher concentration.