When a sperm and egg join to form a zygote in humans, what determines the sex of the child that is produced?

Prepare for the NLN PAX Science Exam with flashcards and multiple choice questions. Each question includes hints and detailed explanations to boost your confidence and exam readiness.

Multiple Choice

When a sperm and egg join to form a zygote in humans, what determines the sex of the child that is produced?

Explanation:
Sex is determined at fertilization by the chromosome combination brought by the gametes. The egg always contributes an X chromosome, while the sperm can carry either X or Y. If the sperm provides X, the zygote is XX and typically develops as female; if the sperm provides Y, the zygote is XY and typically develops as male. The Y chromosome’s SRY gene drives male development, while its absence leads to female development. So the sperm determines the baby's sex.

Sex is determined at fertilization by the chromosome combination brought by the gametes. The egg always contributes an X chromosome, while the sperm can carry either X or Y. If the sperm provides X, the zygote is XX and typically develops as female; if the sperm provides Y, the zygote is XY and typically develops as male. The Y chromosome’s SRY gene drives male development, while its absence leads to female development. So the sperm determines the baby's sex.

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