Identical Twins: DNA, Conception, Statistics, and More - Verywell …
https://www.verywellhealth.com/identical-twins-facts-5217452
WebMar 9, 2022 · Identical twins, also known as monozygotic twins, share the same egg at conception and are always either both boys or both girls. Fraternal twins, also known as dizygotic twins, come from two separate eggs fertilized at the same time. They could be the same sex or different.
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