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Questions and Answers
What are multiple alleles?
What are multiple alleles?
- When two alleles control a trait
- When genes are only inherited from one parent
- When alleles do not affect a trait
- When three or more alleles control a trait (correct)
Give an example of multiple alleles.
Give an example of multiple alleles.
Blood Types in humans
Each individual can have more than two alleles for each trait.
Each individual can have more than two alleles for each trait.
False (B)
Which of these statements is true regarding ABO blood groups?
Which of these statements is true regarding ABO blood groups?
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Type O is the __________ donor.
Type O is the __________ donor.
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Type AB is the universal __________.
Type AB is the universal __________.
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What is codominance?
What is codominance?
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Provide an example of codominance.
Provide an example of codominance.
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Study Notes
Multiple Alleles Overview
- Multiple alleles refer to a situation where three or more alleles influence a single trait.
- Individuals inherit two alleles for each trait, one from each parent.
Blood Types as an Example
- Human blood types serve as a prime example of multiple alleles.
- Three alleles govern the ABO blood group system: IA, IB, and i.
ABO Blood Groups
- Four possible phenotypes arise from the ABO blood groups: A, B, AB, and O.
- Six genotypes correlate with these blood types:
- Type A: IAIA or IAi
- Type B: IBIB or IBi
- Type AB: IAIB
- Type O: ii
- Type A has two possible genotypes, type B has two, type AB has one, and type O has one.
Universal Donor and Acceptor
- Type O blood is recognized as the universal donor due to the lack of antigens.
- Type AB blood is known as the universal acceptor because it has both A and B antigens present.
Codominance Explained
- Codominance occurs when both alleles in a heterozygous individual are fully expressed.
- Blood type AB exemplifies codominance, where both A and B antigens are expressed equally in the phenotype.
- In this genetic relationship, A is dominant over O, and B is also dominant over O.
Rh Factor
- The Rh factor determines the presence or absence of the Rhesus protein on red blood cells, affecting blood compatibility.
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Description
Test your knowledge on multiple alleles with this quiz. Explore the concepts of blood types and the genetics behind traits controlled by three or more alleles. Perfect for biology students wanting to deepen their understanding of genetic variations.
