Twin
One of two offspring produced in the same pregnancy
Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.
Nº Q159979 ★★★★
Super Rare · Knowledge
Twin
One of two offspring produced in the same pregnancy
Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.
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From Wikipedia
Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. Since identical twins develop from one zygote, they will share the same chromosomal sex, while fraternal twins may or may not. In very rare cases, fraternal or (semi-) identical twins can have the same mother and different fathers. In contrast, a fetus that develops alone in the womb (the much more common case in humans) is a singleton; one of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgänger.
Text: Wikipédia, CC BY-SA 4.0. · Image: Wikimedia Commons (CC BY 4.0) ·
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Conjoined twins
Twins physically joined in utero
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Gamete
Cell that fuses during fertilisation, such as a sperm or egg cell
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Sibling
One of two or more individuals having at least one parent in common
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Embryo
Multicellular diploid eukaryote in its earliest stage of development
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Identical twins
Twins with the same genes, that grew from female germ cell and one sperm that later split into two in the womb
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Egg
Organic vessel in which an embryo first begins to develop
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