1. Which of the following pairs share 50% of their genes? Any two siblings A pair of dyzogotic twins A pair of monozygotic twins a and b 2. Regarding types of multiple pregnancy, which of the following are true? a. Dizygotic twins result from fertilization of different oocytes by the same sperm. b. Monozygotic twins result from mitotic division of a single zygote into 'identical' twins. c. Dizygotic twins result from the division of a single fertilized egg. d. Monozygotic twins result from 2 egg cells merged together, eventually fertilized by a sperm cell. 3. Fraternal twins make up approximately of the twin population.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.