Genetic Inheritance Quiz Chapter 23

What is a pedigree chart?

• A chart of a family's history with regard to a particular genetic trait.

• A chart of a family's medical history.

• A chart of a family's educational history.

• A chart of a family's financial history.

Answer explanation

A pedigree chart is a chart of a family's history with regard to a particular genetic trait.

Which organisms can pedigree charts be used on?

• Humans only

• Pea plants only

• Dogs and cats only

• Humans, dogs, and cats

Answer explanation

Pedigree charts can be used on humans, dogs, and cats. They help track genetic traits and inheritance patterns.

Which statement is true for autosomal recessive disorders?

• Most affected children have affected parents.

• Heterozygotes have an affected phenotype.

• Two affected parents can produce an unaffected child.

• Both males and females are equally affected.

Answer explanation

Autosomal recessive disorders can occur in children with unaffected parents who are carriers of the recessive gene.

Which statement is true for autosomal dominant disorders?

• Only males are affected.

• Two unaffected parents will have affected children.

• Heterozygotes are unaffected.

• Affected children will usually have an affected parent.

Answer explanation

Autosomal dominant disorders are characterized by affected children usually having an affected parent.

What is the likelihood of affected children when close relatives reproduce?

• More likely to have affected children.

• Cannot be determined.

• Less likely to have affected children.

• No effect on the likelihood of affected children.

Answer explanation

Close relatives reproducing increases the likelihood of affected children.