Multiple Choice
What is the inheritance pattern of the disorder shown in the pedigree?
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13. Mendelian Genetics
Pedigrees
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What is the most likely mode of inheritance for the trait shown in this pedigree?
A
X-linked dominant
B
Autosomal dominant
C
Mitochondrial inheritance
D
Autosomal recessive
Verified step by step guidance1
Examine the pedigree chart to identify patterns of inheritance. Look for whether the trait appears in every generation, which is a key indicator of dominant inheritance.
Determine if the trait affects both males and females equally. If it does, this suggests autosomal inheritance rather than X-linked inheritance.
Check if the trait is passed from affected parents to their children. In autosomal dominant inheritance, an affected individual has at least one affected parent.
Consider if the trait is passed from mothers to all their children, which would suggest mitochondrial inheritance. If this pattern is not observed, mitochondrial inheritance is unlikely.
Evaluate if the trait skips generations, which is characteristic of autosomal recessive inheritance. If the trait does not skip generations, autosomal recessive inheritance is unlikely.
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