XY sex-determination system - Wikipedia In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively
Sex-determination system - Wikipedia In animals this is often accompanied by chromosomal differences, generally through combinations of XY, ZW, XO, ZO chromosomes, or haplodiploidy The sexual differentiation is generally triggered by a main gene (a "sex locus"), with a multitude of other genes following in a domino effect
Sex chromosome | Definition, Examples, Facts | Britannica Individuals having two X chromosomes (XX) are female; individuals having one X chromosome and one Y chromosome (XY) are male The X chromosome resembles a large autosomal chromosome with a long and a short arm The Y chromosome has one long arm and a very short second arm
How Is Your Sex Determined? | Ask A Biologist People usually have two sex chromosomes Typically, embryos with one X and one Y chromosome develop into males And those with two X chromosomes usually become females We get one sex chromosome from our fathers, carried by sperm, and one from our mothers, carried by the egg