Refer to the Following Information to Answer the Questions Below

question 42

Multiple Choice

Refer to the following information to answer the questions below.
Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all.
-A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce

• A) all sharp-spined progeny.
• B) 50% sharp-spined, 50% dull-spined progeny.
• C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny.
• D) all spineless progeny.
• E) It is impossible to determine the phenotypes of the progeny.

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Definitions:

Kinesthesis

The sense of body position and movement of body parts; also called kinesthesia.

Equilibrium

The sense of balance.

Homeostasis

The ability of an organism or environment to maintain stability in spite of changes.

Phantom Limb Pain

Pain that feels like it's coming from a body part that's no longer there, often experienced by amputees.