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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