Multiple Choice
Which genetic phenomenon involves the exchange of genetic material between homologous chromosomes during meiosis?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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When the interaction of genes alters expected Mendelian genetic ratios, this phenomenon is called:
A
epistasis
B
pleiotropy
C
linkage
D
codominance
Verified step by step guidance1
Understand the question is asking about a genetic phenomenon where gene interactions change the expected Mendelian ratios.
Recall that Mendelian ratios are based on independent assortment and simple dominant-recessive relationships between alleles.
Identify that when one gene affects or masks the expression of another gene, altering these expected ratios, this is a specific genetic interaction.
Recognize that 'epistasis' is the term used to describe this interaction where one gene masks or modifies the effect of another gene.
Differentiate epistasis from other options: 'pleiotropy' refers to one gene affecting multiple traits, 'linkage' refers to genes located close together on a chromosome, and 'codominance' refers to both alleles being expressed equally.
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