How do we know that X chromosomal inactivation of either the paternal or maternal homolog is a random event during early development in mammalian females? Select all that apply.   a. Studying the electrophoretic variants of glucose-6-phosphate dehydrogenase.   b. Using test crosses involving females possessing different genetic markers in sex chromosomes.   c. Cytological studying during the blastocyst stage of development.   d. Observing the mosaic coat patterns inheritance.   e. Using electronic microscopy to track the inactivation of X chromosome.

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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.