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test-cross

n.
1.a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring

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    Idiom of the Day

    stand (someone) in good stead with (someone or something)
    to be an advantage to someone
    Working hard will stand you in good stead with your company.



    1.
    A ________ had broken the back door and stolen my golden necklace.

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