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Discus two case of testcross?

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What is a discus?

  It looks like a frisby.It is solid and heavy. I believe the discus throw is part of the summer Olympics.

What is a testcross?

A cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait
In Biology

What is a testcross in biology?

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 determ