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 11
A pedigree shows a trait that appears only in males and is passed from father to all sons. What is the most likely mode of inheritance?
A pedigree shows a trait that skips generations and affects both males and females equally. What is the most likely mode of inheritance?
A pedigree shows that a trait is present in every generation and both males and females are equally affected. 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 a carrier female for an X-linked recessive trait in a pedigree.
Describe the difference between a proband and a carrier in a pedigree.
Explain why consanguineous marriages increase the risk of autosomal recessive disorders in offspring.
Explain why X-linked recessive disorders are more common in males than in females.
If a man with an X-linked recessive disorder marries a woman who is a carrier, what is the probability that their daughter will be affected?
If a trait is autosomal recessive, what is the genotype of an unaffected individual who has an affected child?
If a trait is X-linked recessive, which sex is more likely to express the trait?
If a woman is affected by an X-linked dominant disorder and her partner is unaffected, what percentage of their sons will be affected?
If both parents are carriers for an autosomal recessive disorder, what is the probability that their child will be affected?
In a pedigree, how is a carrier of a recessive trait often represented?
In a pedigree, what does a circle represent?
In a pedigree, what does a double horizontal line between a male and female indicate?
In a pedigree, what does a square represent?
In a pedigree, what does a symbol with a small letter 'P' next to it usually indicate?
What is a pedigree chart used for in genetics?
