Independent Assortment Video Lessons

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Problem: Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessivess 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 dull spineless cactus would produce ___________.a. all spineless progenyb. all sharp-spined progenyc. 50% sharp-spined, 50% dull-spined progenyd. 25% sharp-spined, 50% dull-spined, 25% spineless progenye. It is impossible to determine the phenotypes of the progeny

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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessivess 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 dull spineless cactus would produce ___________.

a. all spineless progeny

b. all sharp-spined progeny

c. 50% sharp-spined, 50% dull-spined progeny

d. 25% sharp-spined, 50% dull-spined, 25% spineless progeny

e. It is impossible to determine the phenotypes of the progeny

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Based on our data, we think this problem is relevant for Professor McCleary's class at USF.