2. An individual heterozygous for 4 genes ABCD was testcrossed, and the progeny were classified by the gametic contribution of the heterozygous parent as follows: a BCD Abcd ABC d abc D a BcD AbCd ABcd ab CD 42 43 140 145 6 9 305 310 Construct a map of the linked genes.

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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.