Question

chapter 8: chromosomes and human genetics: curing the incurable
8.5. compare and contrast the inheritance of recessive, dominant, and sex - linked genetic disorders.
complete the passage.
some genetic disorders are said to “skip a generation,” but they are present in a parent, known as a
, who has a copy of the allele for the disorder that is by another allele. the only
disorders that cannot be inherited in this way are. in disorders that are, only one
parent, the, can pass on the disorder without expressing it.
mother masked carrier autosomal dominant sex - linked autosomal recessive
enhanced father

Explanation:

• A carrier is an individual who has a recessive allele for a disorder but does not express it because the allele is masked by a dominant allele.
• Autosomal dominant disorders cannot skip generations as only one copy of the dominant allele is needed for expression.
• In sex - linked disorders (usually X - linked recessive), the mother (as she has two X chromosomes) can be a carrier (having one recessive X - linked allele masked by a normal X allele) and pass on the disorder without expressing it (if she is heterozygous for the X - linked recessive trait).

Answer:

carrier, masked, autosomal dominant, sex - linked, mother