Multiple Choice
Which genetic phenomenon is described when one gene has several different forms, resulting in more than two phenotypes?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
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Which of the following is NOT a type of dominance?
A
Complete dominance
B
Incomplete dominance
C
Codominance
D
Leaky dominance
Verified step by step guidance1
Understand the concept of dominance in genetics: Dominance refers to the relationship between alleles, where one allele masks the expression of another in a heterozygous individual.
Review the types of dominance: Complete dominance occurs when the phenotype of the heterozygote is the same as that of the dominant homozygote. Incomplete dominance results in a phenotype that is intermediate between the two homozygotes. Codominance occurs when both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits.
Identify the term 'Leaky dominance': This term is not a standard type of dominance in genetics. It may refer to a situation where a dominant allele does not completely mask the effects of a recessive allele, but this is not a recognized category like the others.
Compare the given options with standard genetic terminology: Complete dominance, incomplete dominance, and codominance are well-established types of dominance in genetics.
Conclude that 'Leaky dominance' is not a recognized type of dominance in genetics, making it the correct answer to the question.
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