A zygote (from Greek ζυγωτός zygōtos "joined" or "yoked", from ζυγοῦν zygoun "to join" or "to yoke"), or zygocyte, is the initial cell formed when two gamete cells are joined by means of sexual reproduction. In multicellular organisms, it is the earliest developmental stage of the embryo. In single-celled organisms, the zygote divides to produce offspring, usually through meiosis.

A zygote is always synthesized from the union of two gametes, and constitutes the first stage in a unique organism's development. Zygotes are usually produced by a fertilization event between two haploid cells—an ovum (female gamete) and a sperm cell (male gamete)—which combine to form the single diploid cell. Such zygotes contain DNA derived from both the parents, and this provides all the genetic information necessary to form a new individual.

In land plants, the zygote is formed within a chamber called the archegonium. In seedless plants, the archegonium is usually flask-shaped, with a long hollow neck through which the sperm cell enters. As the zygote divides and grows, it does so inside the archegonium.

Patrick Joseph Cowley (October 19, 1950 - November 12, 1982) was an American disco and Hi-NRG dance music composer and recording artist. He recorded in a style that has drawn comparisons^{[by whom?]} to that of Giorgio Moroder and is often credited^{[by whom?]} with pioneering electronic dance music.

Patrick Cowley was born in Buffalo, New York to Ellen and Kenneth Cowley. Cowley's family originated in the Horseheads and Corning areas of New York and lived in Rochester. During his teenage years, Cowley became a successful drummer with local amateur bands before attending Niagara University and later the University at Buffalo to study English. In 1971, at the age of 21, Cowley moved to San Francisco to attend the City College of San Francisco where he studied music, specifically the use of synthesizers.

Cowley met San Francisco-based musician Sylvester in the late 1970s. Sylvester had asked Cowley to join his studio band after hearing some of his early synthesizer recordings.

Cowley's own hits included "Menergy" in 1981, a frank celebration of the gay club scene, and "Megatron Man", which hit #1 and #2 respectively on the Billboard Hot Dance Music/Club Play chart in 1982. That same year, Patrick Cowley became the DJ at the "Menergy" parties at The EndUp in San Francisco. He also wrote and produced the dance single "Right on Target" for San Francisco artist Paul Parker, which also reached #1 on the Billboard dance chart in 1982. A collaboration with Sylvester, "Do Ya Wanna Funk", made #4 on the Billboard dance chart that same year. Cowley also did a 15'45" long remix of Donna Summer's "I Feel Love", which is now a collector's item. His final album, Mind Warp, was composed as he felt the increasing effects of HIV infection, and its songs reflect his increasing detachment from conventional reality as the disease progressed. Cowley only released three solo albums, but groups including the Pet Shop Boys and New Order cite Cowley's style as a major influence.