Multiple choice

Twins that develop from a single zygote are called

  1. heterozygote

  2. identical

  3. non placental

  4. fraternal

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Twins can be either monozygotic ("identical"), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ("fraternal"), meaning that they develop from two different eggs. In fraternal twins, each twin is fertilized by its own sperm cell.

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