1. Can you think of anything that would prevent meiosis from occurring in an organism with one set of chromosomes? 2. Cell-free fetal DNA analysis can be used to determine whether a fetus has trisomy 21 (Down syndrome). Speculate about how this diagnosis could be achieved, even though this cell-free test does not visualize the chromosomes directly as in a karyotype

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A: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAbQAAAExCAYAAAAUSVctAAAAAXNSR0IArs4c6QAAIABJREFUeF7snQ…

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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.