Understanding Pedigree Analysis

What shape represents a male in a pedigree chart?

• Hexagon

• Square

• Triangle

• Circle

Which hypothesis suggests that an affected individual must have at least one affected parent?

• Autosomal Dominant

• X-linked Recessive

• Y-linked

• Autosomal Recessive

Why can the X-linked dominant hypothesis be ruled out in the given example?

• Both parents are affected

• Neither parent is affected

• Only males are affected

• Only females are affected

What is the probability that all children are unaffected if one parent is heterozygous for a dominant condition?

• 3%

• 0.5%

• 50%

• 25%

What does it mean if a genetic condition is fully penetrant?

• It is always lethal

• It manifests in all carriers

• It skips generations

• It affects only males

In a consanguineous mating, what is the likelihood of recessive conditions appearing?

• Unchanged

• Eliminated

• Decreased

• Increased

What is the probability that an individual is a carrier if they are not affected by a recessive condition?

• 1/2

• 1/3

• 2/3

• 1/4

Which inheritance pattern is suggested if all affected individuals are male and generations are skipped?

• X-linked Recessive

• Autosomal Recessive

• Autosomal Dominant

• Y-linked

What is a key feature of autosomal dominant conditions in pedigrees?

• They are always new mutations

• They do not skip generations

• They affect only males

• They skip generations

What should be evaluated first when analyzing a pedigree?

• Penetrance vs Expressivity

• Autosomal vs X-linked

• Dominance vs Recessivity

• X-linked vs Y-linked