The Presence of a Recessive Allele

question 40

Multiple Choice

The presence of a recessive allele:

• A) can always be determined from the phenotype.
• B) is usually masked in the phenotype.
• C) is expressed in the phenotype alongside a dominant allele.
• D) can never be expressed in the phenotype.

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Definitions:

Pupil Diameter

The size of the opening in the center of the iris of the eye, which varies to regulate the amount of light reaching the retina.

Hyperpolarizing

Pertains to the increase in a cell's membrane potential, making it more negative.

Photoreceptor Cell

A photoreceptor cell is a type of specialized neuron found in the retina of the eye, responsible for converting light into electrical signals that can be interpreted by the brain as visual images.

Rods

Photoreceptor cells in the retina of the eye, highly sensitive to light, which enable vision in low light conditions.