2. Woody Guthrie, who wrote This Land is Your Land, was heterozygous for Huntington's disease (Hh). His wife was homozygous recessive and perfectly normal (hh). Huntington's disease is caused by a latent dominant gene, meaning that it is not phenotypically (physically) expressed until later in life. Dominant disease genes are expressed in homozygous dominant and heterozygous people (HH or Hh). Draw a punnet square for Woody and his wife.

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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.