Multiple Choice
Why might LGBTQ rights groups emphasize that homosexuality has a genetic origin?
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22. Evolution of Populations
Genetics and Allele Frequencies
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Blood type in humans is an example of which type of genetic inheritance?
A
Incomplete dominance
B
Multiple alleles
C
Simple dominance
D
Sex-linked inheritance
Verified step by step guidance1
Understand the concept of genetic inheritance: Genetic inheritance refers to how traits are passed from parents to offspring through genes. Different types of inheritance patterns exist, such as incomplete dominance, multiple alleles, simple dominance, and sex-linked inheritance.
Review the definition of multiple alleles: Multiple alleles refer to a situation where a single gene has more than two alleles controlling a trait. In humans, blood type is determined by the ABO gene, which has three alleles: IA, IB, and i.
Compare multiple alleles with other inheritance types: Incomplete dominance occurs when neither allele is completely dominant, resulting in a blend of traits. Simple dominance involves one allele being completely dominant over the other. Sex-linked inheritance refers to traits controlled by genes located on sex chromosomes. Blood type does not fit these patterns.
Analyze the ABO blood group system: The ABO blood group system is an example of multiple alleles because the IA and IB alleles are codominant (both expressed when present together), while the i allele is recessive. This system allows for four possible blood types: A, B, AB, and O.
Conclude that blood type in humans is an example of multiple alleles inheritance: Based on the characteristics of the ABO blood group system, blood type is determined by multiple alleles, making this the correct answer.
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