Gender determination

Gender determination

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Credit: DAVID NICHOLLS/SCIENCE PHOTO LIBRARY

Caption: Gender determination, computer artwork. Gender is determined by the sex chromosomes, X and Y. Females have 2 X chromosomes and men an X and a Y chromosome. Cells in the ovaries and testes undergo meiosis producing 4 cells (only 2 of each seen here) with half the number of chromosomes, and hence only 1 sex chromosome each. The female sex cell is an egg (pink) and the male a sperm (with tail). During fertilisation a male and female gamete fuse to form a zygote, restoring the full number of chromosomes. The sex of the zygote is determined by the sex chromosome carried by the sperm cell.

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Keywords: anatomy, artwork, biological, biology, cells, chromosome, chromosomes, computer artwork, determination, dividing, egg, eggs, female, gamete, gametes, gametogenesis, gender, genetics, hereditary, human body, illustration, male, meiosis, meiotic, nuclear division, oocyte, oocytes, reproducing, reproduction, sex, sex cell, sperm, spermatazoan, spermatozoa, spermatozoon, sperms, zygote, zygotes

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