Linked Genes Challenge Mendel’s Principle of Independent Assortment
Mendel’s principle of independent assortment states that alleles for different genes segregate independently during gamete formation.
However, this only applies to genes on different chromosomes or those far apart on the same chromosome.
Linked genes, locatedclose together, do not assort independently because they tend tostay together during meiosis.
Chromosome Diagrams Visualize Gene Linkage
To represent linked genes, geneticists use diagrams of homologous chromosomes, with alleles marked as tick marks alongside vertical lines representing the chromosomes.
Genes located close together on the same chromosome tend to be inherited as a unit because they are physically linked.
During meiosis, homologous chromosomes separate, but linked genes often travel together unless crossing over occurs.
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Why does the phenomenon of gene linkage serve as an exception to the principle of independent assortment?
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Does Mendel's principle of independent assortment apply to linked genes?
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Note
Introduction to Gene Linkage
Gene linkage refers to the tendency of genes located close together on the same chromosome to be inherited together.
This concept challenges Mendel's principle of independent assortment, which states that genes for different traits assort independently during gamete formation.
DefinitionGene LinkageThe tendency of genes located close together on the same chromosome to be inherited together.
AnalogyThink of linked genes like train cars connected on the same track - they tend to travel together unless something forces them apart.
ExampleIn fruit flies, the genes for body color and wing length are linked because they are located on the same chromosome.
