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1 November, 04:57

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 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 (ssnn) would produce what types of offspring?

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  1. 1 November, 05:42
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    All the offspring will have sharp-spined phenotype.

    Explanation:

    By crossing a true-breeding sharp-spined cactus with a spineless cactus, we're crossing a NNSS x nnss. So to determine the offspring's type, we should consider the gametes that would be produced.

    The true-breeding sharp-spined cactus can only produce gametes NS, while the spineless one would produce only ns gametes.

    As a result, all the individuals of the first generation after the crossing will have the genotype NnSs.

    That means, all the cactus of the offspring will have sharp-spined phenotype.
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