Pedigree Analysis
Biology ⇒ Genetics and Heredity
Pedigree Analysis starts at 10 and continues till grade 12.
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See sample questions for grade 10
A pedigree shows a trait that affects both males and females equally and skips generations. What is the most likely mode of inheritance?
A pedigree shows that only males are affected and the trait is passed from father to son. What is the most likely mode of inheritance?
Describe how consanguinity can affect the results of pedigree analysis.
Describe how you would identify a carrier of an autosomal recessive trait in a pedigree.
Describe the difference between autosomal and sex-linked inheritance as seen in pedigrees.
Explain why mitochondrial inheritance is only passed from mothers to all their children.
Explain why pedigree analysis is important in genetic counseling.
Explain why X-linked recessive traits are more common in males than females.
A pedigree shows a trait that appears in every generation. This pattern most likely indicates: (1) Autosomal recessive inheritance (2) Autosomal dominant inheritance (3) X-linked recessive inheritance (4) Mitochondrial inheritance
A pedigree shows a trait that appears only in males and is never passed from father to son. What is the most likely mode of inheritance? (1) Autosomal dominant (2) X-linked recessive (3) Y-linked (4) Mitochondrial
If a pedigree shows that a trait is passed from mother to all her children, but not from fathers, what is the likely mode of inheritance? (1) Autosomal dominant (2) X-linked dominant (3) Mitochondrial (4) Y-linked
If a pedigree shows that all daughters of an affected father are affected, but none of his sons are, what is the likely mode of inheritance? (1) Autosomal dominant (2) X-linked dominant (3) Y-linked (4) Autosomal recessive
Fill in the blank: In a pedigree, a diagonal line through a symbol indicates that the individual is _______.
Fill in the blank: In a pedigree, a diamond symbol is used when the _______ of the individual is unknown.
Fill in the blank: In a pedigree, a half-shaded symbol often represents a _______.
Fill in the blank: In a pedigree, a triangle symbol is sometimes used to represent a _______.
True or False: In a pedigree, a horizontal line connecting a square and a circle represents marriage or mating.
True or False: In a pedigree, a horizontal line connecting two symbols at the same level represents siblings.
True or False: In a pedigree, a symbol with a small letter 'P' inside it usually represents the proband.
True or False: In autosomal dominant inheritance, two unaffected parents can have an affected child.
