Pedigree Analysis
Biology ⇒ Genetics and Heredity
Pedigree Analysis starts at 10 and continues till grade 12.
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A pedigree shows a trait that affects both males and females equally and appears in every generation. What is the most likely mode of inheritance?
A pedigree shows a trait that only appears in males and is passed from father to all sons. What is the most likely mode of inheritance?
Describe how you would distinguish between autosomal dominant and autosomal recessive inheritance using a pedigree.
Describe how you would identify an X-linked recessive trait in a pedigree.
A pedigree shows a trait that affects both males and females equally and appears in every generation. What is the most likely mode of inheritance?
A pedigree shows a trait that only appears in males and is passed from father to all sons. What is the most likely mode of inheritance?
A pedigree shows that affected individuals are only male, and the trait is never passed from mother to son. Which inheritance pattern is least likely?
(1) Autosomal dominant
(2) X-linked recessive
(3) Y-linked
(4) Mitochondrial
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?
A pedigree shows that affected individuals are only male, and the trait is never passed from mother to son. Which inheritance pattern is least likely?
(1) Autosomal dominant
(2) X-linked recessive
(3) Y-linked
(4) Mitochondrial
Which of the following best describes a proband in a pedigree?
(1) The oldest family member
(2) The first affected individual identified
(3) The youngest child
(4) The carrier of the trait
Which of the following is a limitation of pedigree analysis?
(1) It can only be used for plants
(2) It cannot detect new mutations
(3) It always gives conclusive results
(4) It is not useful for rare traits
Which of the following is a reason why pedigree analysis is important in medicine?
(1) It helps diagnose infectious diseases
(2) It helps trace the inheritance of genetic disorders
(3) It is used to determine blood pressure
(4) It is used to measure intelligence
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 usually represents a ______.
Fill in the blank: In a pedigree, a trait that is present in every generation is likely to be ______.
Fill in the blank: In a pedigree, a vertical line from a couple to their children is called a ______ line.
True or False: In a pedigree, a shaded symbol indicates an individual who expresses the trait being studied.
True or False: In autosomal dominant inheritance, two unaffected parents can have an affected child.
True or False: In X-linked recessive inheritance, affected fathers can pass the trait to their sons.
True or False: Males are more likely to express X-linked recessive traits than females.
