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What is epistasis and how does it differ from the interaction between alleles of the same gene?
What is epistasis and how does it differ from the interaction between alleles of the same gene?
Epistasis is the interaction between different genes, not between alleles of the same gene, and it affects the phenotypic ratios. It occurs when one gene masks or affects the phenotype of another.
What is the role of a modifier gene in epistasis?
What is the role of a modifier gene in epistasis?
A modifier gene, also known as an epistatic gene, affects the expression of another gene, either by inactivating its product, counteracting its effects, or removing it from the structure needed for the phenotype.
What is the difference between recessive epistasis and dominant epistasis?
What is the difference between recessive epistasis and dominant epistasis?
In recessive epistasis, a homozygous recessive allele at one locus prevents the other locus from exerting its phenotype, whereas in dominant epistasis, a dominant allele at one locus prevents the other locus from exhibiting the homozygous recessive phenotype.
How does duplicate recessive epistasis modify the 9:3:3:1 phenotypic ratio?
How does duplicate recessive epistasis modify the 9:3:3:1 phenotypic ratio?
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What is the characteristic of duplicate dominant recessive epistasis?
What is the characteristic of duplicate dominant recessive epistasis?
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How does duplicate gene epistasis with cumulative effect modify the 9:3:3:1 phenotypic ratio?
How does duplicate gene epistasis with cumulative effect modify the 9:3:3:1 phenotypic ratio?
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how many different types of epistasis are there and what are the names?
how many different types of epistasis are there and what are the names?
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what is the ratio for recessive epistasis and give and eg
what is the ratio for recessive epistasis and give and eg
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dominant epistasis ratio and eg
dominant epistasis ratio and eg
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dominant and recessive epistasis ratio
dominant and recessive epistasis ratio
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Study Notes
Epistasis: Interaction Between Genes
- Epistasis refers to the phenomenon where one gene masks or affects the phenotype of another gene.
Types of Epistasis
Recessive Epistasis
- Occurs when a homozygous recessive genotype at one locus prevents the expression of another locus.
- Example: ABO blood grouping, where the 9:3:3:1 ratio is modified to 9:3:4.
Dominant Epistasis
- Happens when a dominant allele at one locus prevents the expression of a homozygous recessive phenotype at another locus.
- Example: 9:3:3:1 ratio modified to 12:3:1.
Dominant and Recessive Epistasis
- Occurs when a dominant allele at one locus produces the same phenotype as a homozygous recessive genotype at another locus.
- Example: 9:3:3:1 ratio modified to 13:3.
Duplicate Recessive Epistasis
- Happens when either locus is homozygous recessive, masking the dominant effect at the other locus.
- Example: 9:3:3:1 ratio modified to 9:7.
Duplicate Dominant Recessive Epistasis
- Occurs when the presence of a dominant allele at either of two loci produces the dominant phenotype.
- Products from either gene perform the same function.
- Example: 9:3:3:1 ratio modified to 15:1.
Duplicate Gene Epistasis with Cumulative Effect
- Happens when a dominant allele at either locus, but not both, produces the same phenotype.
- Example: Not specified, but implies an additive effect.
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Description
Test your understanding of epistasis, a phenomenon where one gene affects the phenotype of another. Learn about the different types of epistasis and how genes interact with each other.