4. Chris and Emma are phenotypically normal but carriers for SCA (gene A). a. What are their genotypes? b. With respect to gene A, what are the possible genotypes of the gametes that they can produce. Chris: Emma: In front of each gamete genotype above write probability of producing that gamete. c. What is the probability that Chris and Emma will have a child affected with SCA? (affected=has the disease="aa" =homozygous recessive) d. Write the cross and draw the Punnett square that demonstrates this. X e. The phenotypic ratio is The genotypic ratio is normal : AA: affected Aa: aa

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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.