Questions and Answers
Which pattern of inheritance occurs when both alleles are expressed equally in the phenotype of the heterozygote?
Co-dominance
What kind of inheritance results in ABO blood type where both IA (A) and IB (B) gene are dominant and are expressed in the phenotype type AB?
Incomplete dominance
Which type of inheritance is rare and is related to genes on the Y chromosome?
Y-linked inheritance
What type of inheritance involves more than two alleles for a particular gene?
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Which pattern of inheritance involves the interaction of multiple genes to produce a particular phenotype?
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What type of inheritance involves the unequal expression of genetic material depending on the parent of origin?
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Which pattern of inheritance involves the exchange of genetic material between homologous chromosomes?
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'Type O' blood in ABO blood type results from which combination of alleles?
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What is the inheritance pattern observed between curly and straight hair in humans?
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Which disease example demonstrates the concept of incomplete dominance?
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When genes are on the same chromosome and inherited together, what is this phenomenon called?
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In Bateson and Reginald Punnett’s experiment on sweet pea, what was the observed frequency of phenotypes in the F1 generation?
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What is the phenotype ratio expected in a cross between true breeds PPLL and ppll?
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Which term describes the phenomenon where two genes on the same chromosome are inherited together?
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What type of inheritance results in ABO blood type where both IA (A) and IB (B) gene are dominant and are expressed in the phenotype type AB?
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Which pattern of inheritance involves the exchange of genetic material between homologous chromosomes?
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In the context of the given text, what is the inheritance pattern observed between curly and straight hair in humans?
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What type of inheritance results in ABO blood type where both IA (A) and IB (B) gene are dominant and are expressed in the phenotype type AB?
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Which term describes the phenomenon where two genes on the same chromosome are inherited together?
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What is the phenotype ratio expected in a cross between true breeds PPLL and ppll?
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Which disease example demonstrates the concept of incomplete dominance?
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What type of inheritance involves more than two alleles for a particular gene?
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Which pattern of inheritance involves the interaction of multiple genes to produce a particular phenotype?
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What type of inheritance is rare and is related to genes on the Y chromosome?
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Study Notes
Inheritance Patterns
- Co-dominance: occurs when both alleles are expressed equally in the phenotype of the heterozygote, e.g., ABO blood type where both IA (A) and IB (B) genes are dominant and expressed in the phenotype type AB.
- Multiple Alleles: involves more than two alleles for a particular gene.
- Polygenic Inheritance: involves the interaction of multiple genes to produce a particular phenotype.
- Imprinting: involves the unequal expression of genetic material depending on the parent of origin.
- Crossing Over: involves the exchange of genetic material between homologous chromosomes.
Blood Types
- Type O blood: results from the combination of alleles ii.
- ABO Blood Type: co-dominance occurs where both IA (A) and IB (B) genes are dominant and expressed in the phenotype type AB.
Hair Texture
- Curly and straight hair in humans: incomplete dominance is observed, where the dominant curly hair allele is not fully expressed.
Disease Example
- Incomplete Dominance: sickle cell anemia is a disease example that demonstrates this concept.
Chromosomes
- Linkage: when genes are on the same chromosome and inherited together, e.g., in Bateson and Reginald Punnett’s experiment on sweet pea.
- Linked Genes: phenomenon where two genes on the same chromosome are inherited together.
Phenotype Ratios
- Cross between true breeds PPLL and ppll: expected phenotype ratio is 1:2:1.
- F1 Generation: observed frequency of phenotypes in the F1 generation is 3:1 in Bateson and Reginald Punnett’s experiment on sweet pea.
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