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This quiz contains 8 questions from a mix of 1 subtopics.
What is epistasis?
the interaction between genes on the same chromosome
an interaction between genes where one gene affects or masks the expression of another gene
an environmental factor that controls the production of melanin
a genetic condition that only affects the coat colour of mice
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What happens when a step in a biochemical pathway is disrupted due to lack of gene expression?
the phenotype has an excess of the final product in the pathway
the phenotype is unaffected
the phenotype lacks the final product in the pathway
the phenotype displays an unusual colour
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What is the difference between recessive and dominant epistasis?
the location of the genes on the chromosome
whether the epistatic allele needs to be recessive or dominant to exert its masking effect
the type of gene that is blocked
the type of phenotype that is produced
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When does recessive epistasis occur?
when the epistatic gene must be homozygous recessive to block the hypostatic gene
when the hypostatic gene is recessive
when the epistatic gene is dominant
when the hypostatic gene must be homozygous recessive to block the epistatic gene
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When does dominant epistasis occur?
when the hypostatic gene must be homozygous recessive to block the epistatic gene
when the hypostatic gene is dominant
when the epistatic gene is dominant and actively modifies or blocks the expression of the hypostatic gene
when the epistatic gene must be homozygous recessive to block the hypostatic gene
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In the context of epistasis, what does the term 'masking' mean?
the process of one gene copying the effects of another gene
the process of one gene enhancing the effects of another gene
the process of one gene blending with the effects of another gene
the process of one gene hiding the effects of another gene
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What is the role of an epistatic gene?
to cancel the expression of another gene
to copy the expression of another gene
to enhance the expression of another gene
to block the expression of another gene
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What is the term for a gene whose expression is blocked by another gene?
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