How are conjoined twins formed?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

How are conjoined twins formed?

Explanation:
Conjoined twins form when a single fertilized egg starts to divide into two embryos but does not finish separating. In identical (monozygotic) twinning, the zygote normally splits to make two individuals; if the split is incomplete, the embryos stay connected, resulting in conjoined twins. If the division were complete, you’d have two separate people. Placental issues aren’t what causes conjoined twins, and while some joined twins may share brain tissue, the key mechanism is the partial division of the embryo rather than a specific brain connection.

Conjoined twins form when a single fertilized egg starts to divide into two embryos but does not finish separating. In identical (monozygotic) twinning, the zygote normally splits to make two individuals; if the split is incomplete, the embryos stay connected, resulting in conjoined twins. If the division were complete, you’d have two separate people. Placental issues aren’t what causes conjoined twins, and while some joined twins may share brain tissue, the key mechanism is the partial division of the embryo rather than a specific brain connection.

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