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Male sperm cells in humans and other mammals are heterogametic and contain one of two types of sex chromosomes. They contain either an X chromosome or a Y chromosome. Female egg cells however, contain only the X sex chromosome and are therfore homogametic. The sperm cell determines the sex of an individual. If a sperm cell containing an X chromosome fertilizes an egg, the resulting zygote will be XX or female.
A) The male determines sex because the sperm can fertilize either a female egg or a male egg. B) The female gamete determines sex because only the female gamete provides cytoplasm to the zygote. C) The male gamete determines sex because each male gamete can contribute either an X or a Y chromosome. D) The chromosome contribution from both parents determines sex because the offspring uses all the parents' chromosomes.