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If an organism is AaBb, which of the following combinations in the gametes is impossible?

A aa

It is impossible for an AaBb organism to have the aa combination in the gametes. It is impossible for each letter to be used more than one time, so it would be impossible for the lowercase a to appear twice in the gametes. It would be possible, however, for Aa to appear in the gametes, since there is one uppercase A and one lowercase a. Gametes are the cells involved in sexual reproduction. They are germ cells.