Early in gestation, all embryos exhibit a pair of sexual organs that look unformed and resemble a mix of testes and ovaries. These are called

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The unformed sexual organs seen early in gestation are called indifferent gonads. These gonads have not yet differentiated into either testes or ovaries and are therefore referred to as "indifferent." Later in gestation, the gonads will begin to differentiate based on the presence or absence of certain hormones.

Early in Gestation, All Embryos Exhibit a Pair of Sexual