Determined by the sex chromosomes; XX for female; XY for male.

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Multiple Choice

Determined by the sex chromosomes; XX for female; XY for male.

Explanation:
Sex is determined by the sex chromosomes: typically XX for female and XY for male. This pattern sets the developmental pathway early in embryos, with the Y chromosome (and its SRY gene) triggering testes formation; without a Y, the default development tends toward ovaries. So the statement describes the process by which biological sex is established, which is why the term is sex determination. The other options refer to a trait linked to sex chromosomes, general cell division, or methods to identify sex, none of which capture how male or female identity is established.

Sex is determined by the sex chromosomes: typically XX for female and XY for male. This pattern sets the developmental pathway early in embryos, with the Y chromosome (and its SRY gene) triggering testes formation; without a Y, the default development tends toward ovaries. So the statement describes the process by which biological sex is established, which is why the term is sex determination. The other options refer to a trait linked to sex chromosomes, general cell division, or methods to identify sex, none of which capture how male or female identity is established.

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