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Spermatozoa "swim" via the rotational movement or flagellating of a tail, and move through chemotaxis into contact with the oocyte where one spermatozoan fertilizes the egg, thereby creating a zygote. Spermatozoa, produced by males, contain a 23rd chromosome that is either an X chromosome female or the analogous Y chromosome male , making each sperm cell either female or male. Sex determination in humans and birds[ edit ] In humans , a normal ovum can carry only an X chromosome of the X and Y chromosomes , whereas a sperm may carry either an X or a Y a non-normal ovum can end up carrying two or no X chromosomes, as a result of an irregularity at either of the two stages of meiosis, while a non-normal sperm cell can end up carrying either no sex-defining chromosomes, an XY pair, or XX pair as a result of the forementioned reason ; ergo the male sperm can play a role in determining the sex of any resulting zygote , if the zygote has two X chromosomes it may develop into a female, if it has an X and a Y chromosome, it may develop into a male.
Notes and references[ edit ] "gamete". Research shows that artificial gametes may be a reproductive technique for same-sex male couples, although a surrogate mother would still be required for the gestation period. Gametes produced by the male parent are called spermatozoa commonly called sperm cells , and female gametes are Oocytes commonly referred to as ova or eggs.
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