Identical twins are produced from the same sperm and egg (whichsplits after the first mitotic division), whereas fraternal twins areproduced from separate sperm and separate egg cells. If two parentswith brown eyes (a dominant trait) produce one twin boy with blueeyes, what are the following probabilities?A. If the other twin is identical, he will have blue eyes.B. If the other twin is fraternal, he or she will have blue eyes.C. If the other twin is fraternal, he or she will transmit the blueeye allele to his or her offspring.D. The parents are both heterozygotes.

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A: 50 percent chances.

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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.