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www.reference.com/science/non-identical-twins-made-a07b...

How Are Non-Identical Twins Made? Nonidentical twins occur when a woman produces two separate eggs that are then fertilized by two different sperm cells. The resulting twins sometimes look alike, but have separate genetic identities, like children of the same parents born during different pregnancies.

en.wikipedia.org/wiki/Twin

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 ('fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

www.quora.com/How-do-non-identical-twins-form-How-is-this...

Non-identical twins form when two eggs are fertilized at the same (or nearly the same) time. The medical term for fraternal twins is dizygotic, which means that they are formed from two separate zygotes. They share about 50% of the DNA of their parents. Identical twins form from a single egg that is fertilized and then splits into two.

www.answers.com/Q/How_are_Non-identical_twins_formed

Non-identical twins are formed only when there are two or more separate egg cells produced by the ovary, they will remain in the fallopian tube until fertilized by a sperm cell or when ...

www.vtaide.com/png/George/twins.htm

Fraternal (Non-identical) twins are formed when two egg cells are fertilized; each egg by a different sperm so that two embryos are formed. Fraternal twins can be of the same or opposite sex and they don't have to look at all alike. Identical twins are formed when one egg after being fertilized by one sperm, divides into two halves. The two halves are genetically identical.

www.answers.com/Q/How_identical_and_non-identical_twins...

Non-identical twins are formed only when there are two or more separate egg cells produced by the ovary, they will remain in the fallopian tube until fertilized by a sperm cell or when ...

www.verywellfamily.com/facts-about-fraternal-twins-2447159

See facts about fraternal twins, including how they differ from identical twins, how they form, and what affects your chances of having multiples. Menu. Verywell Family. 11 Surprising Facts About Fraternal Twins ... As medical technology made fertility-enhancing treatments more accessible, the twin birth rate skyrocketed in the late 20th century.

www.answers.com/Q/How_are_non-identical_twins_made

non identical twins are made when occasionally during the woman's period she lets two eggs out at the same time, which are fertilised by two sperms to form non identical twins.

www.huggies.com.au/childbirth/multiple-births/twins/identical

Identical Twins. The odds of having twins are far greater than for any other type of multiple births. Around 90% of all multiples are made up of twins; the remaining 10% is with triplets, quadruplets and very occasionally quintuplets and more.

www.betterhealth.vic.gov.au/.../twins-identical-and-fraternal

Twins account for over 90 per cent of multiple births. To form identical or monozygotic twins, one fertilised egg (ovum) splits and develops into two babies with exactly the same genetic information. To form fraternal or dizygotic twins, two eggs (ova) are fertilised by two sperm and produce two genetically unique children.