Xg is an antigen found on red blood cells. This antigen is caused by an Xlinked allele (Xa) that is dominant over an allele for the absence of the antigen (X–). The inheritance of these X-linked alleles was studied in children with chromosome abnormalities to determine where nondisjunction of the sex chromosomes took place. For each type of mating in parts a through d, indicate whether nondisjunction took placein the mother or in the father and, if possible, whether it took place in meiosis I or meiosis II (assume no crossing over). Q. XaY × XaX- → X- (Turner syndrome)

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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.