Inbreeding Results in a Higher Frequency of ________ in a Population

question 38

Multiple Choice

Inbreeding results in a higher frequency of ________ in a population. Inbreeding depression occurs because _______.

• A) deleterious alleles; individuals with deleterious alleles have high mortality
• B) heterozygosity; heterozygotes have lower fitness
• C) homozygosity; deleterious recessive alleles are expressed more often
• D) heterozygosity; deleterious dominant alleles are expressed more often

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Definitions:

Dizygotic

Refers to twins that are developed from two separate fertilized eggs, also known as fraternal twins, resulting in siblings that are genetically similar but not identical.

Sex-linked Recessive Disorders

Genetic disorders that are carried on the sex chromosomes, typically the X chromosome, and are expressed in the phenotype only when a dominant allele is not present.

Down Syndrome

A genetic disorder caused by the presence of an extra chromosome 21, characterized by physical growth delays, characteristic facial features, and mild to moderate intellectual disability.

Down Syndrome

A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by distinct physical features and intellectual disability.