Scientists frequently study identical human twins who were separated at birth. Thus, the correct answer is identical human twins that were separated at birth.
To produce identical twins, one fertilized egg (ovum) divides and produces two newborns with identical genetic material. This is in contrast to fraternal twins, in which two eggs (ova) are fertilized by two sperm, resulting in two genetically distinct infants who are no more identical than individual siblings born on separate dates. Twins are almost equally likely to be male or female. Contrary to common assumption, the occurrence of twins does not pass down across generations.
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