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Two sex chromosomes determine the sex of an individual, and they are called the X chromosome and the Y chromosome. - autosomes comprise the other 22 chromosomes. The longestâ¦ of the autosomes is referred to as chromosome 1, the next largest as chromosome 2, and so on, down to the smallest autosomes, chromosomes 21 and 22.
The sex chromosomes are the X chromosome and the Y chromosome. Sex Chromosomes. In human sexual reproduction, two distinct gametes fuse to form a zygote. Gametes are reproductive cells produced by a type of cell division called meiosis. Gametes are also called sex cells. They contain only one set of chromosomes and are said to be haploid. The male gamete, called the spermatozoan, is relatively motile and usually has a flagellum. The female gamete, called the ovum, is nonmotile and relatively large in comparison to the male gamete.