This question is about a medical condition that is inherited as an autosomal dominant allele. In this condition the dominant allele is lethal when homozygous. Recall that autosomal genes are found on non-sex chromosomes.   Two parents who are thinking of having another child are trying to determine the likelihood of passing on this allele to their children. They consult you to find the answers to their questions. One of them has the condition and one does not. Their first child is unaffected. What is the probability that their second child is unaffected

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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.