Multiple Choice
Which type of allele is sometimes referred to as a loss-of-function gene?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
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Which of the following best describes dominant alleles in the context of genetic inheritance?
A
They are always expressed only in homozygous individuals.
B
They mask the expression of recessive alleles in heterozygotes.
C
They are less likely to be inherited than recessive alleles.
D
They result in intermediate phenotypes when paired with recessive alleles.
Verified step by step guidance1
Understand the concept of alleles: Alleles are different versions of a gene that can exist at a specific locus on a chromosome.
Recall the definition of dominant alleles: A dominant allele is one that expresses its trait even when only one copy is present (heterozygous condition).
Recognize that dominant alleles mask the expression of recessive alleles in heterozygotes, meaning the phenotype of the dominant allele is observed when paired with a recessive allele.
Note that dominant alleles are not necessarily more likely to be inherited than recessive alleles; inheritance depends on allele frequency and chance, not dominance.
Understand that intermediate phenotypes (incomplete dominance) occur when neither allele is completely dominant, which is different from the classic dominant-recessive relationship.
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