What term did Mendel use for an individual that was heterozygous?

The test cross. Mendel also came up with a way to figure out whether an organism with a dominant phenotype (such as a yellow-seeded pea plant) was a heterozygote (Yy) or a homozygote (YY). This technique is called a test cross and is still used by plant and animal breeders today.

Explanation:

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it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.