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  2. Heredity of twins can be summarized as follows1234:
    • Fraternal twins (two babies from two different eggs) can run in families, and genetics play a role in having them.
    • Identical twins (born from the same egg) are not directly influenced by heredity.
    • If a woman has a sibling who is a fraternal twin, she is 2.5 times more likely to have twins.
    • Identical twins share 100% of their genes, while fraternal twins share 50%.
    Learn more:
    Yes, some types of twins are hereditary, meaning that twins run in families. Heredity on the mother's side ups a couple's odds of conceiving fraternal twins. Fraternal twins are two babies from two different eggs that were released from the ovaries simultaneously.
    www.whattoexpect.com/pregnancy/twins-and-multi…
    Having identical twins is not genetic. On the other hand, fraternal twins can run in families. Genetics can definitely play a role in having fraternal twins. For example, a woman that has a sibling that is a fraternal twin is 2.5 times more likely to have twins than average! However, for a given pregnancy, only the mother’s genetics matter.
    www.thetech.org/ask-a-geneticist/articles/2014/twi…
    Identical twins share 100% of their genes. They are always born of the same sex. It can be challenging to tell identical twins apart. Whereas fraternal twins often look more like siblings than twins. They share 50% of their genes and could be of the same or different sexes at birth.
    www.verywellhealth.com/identical-twins-facts-5217…
    Heritable means capable of being inherited or passed on and an estimate of heritability describes how much variation is due to genetics. It means that if the trait shows more similarity in identical twins than in fraternal twins, it is assumed to be more heritable and therefore due to genes rather than the environment.
    medicover-genetics.com/twins-from-a-genetic-poin…
     
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