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17 August, 12:23

According to Mendel's law of dominance, which statement best describes the result of a cross between parents with genotypes Rr and Rr?

A) Only RR offspring will have red flowers.

B) Only Rr offspring will have red flowers.

C) All offspring with at least one R will have red flowers.

D) Because of the law of dominance, all offspring will have red flowers.

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  1. 17 August, 14:59
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    The answer is C: All offspring with at least one R will have red flowers.

    Explanation:

    Mendel's Law of Dominance states that: "In a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype."

    This simply means that if there exists two contrasting traits (I. e Rr), one of the traits will always suppress the other, thereby expressing itself. R suppresses r, thus making the offspring with big R have red flowers. The trait is called a dominating trait and the suppressed is called recessive trait.
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