Crossing Over and Recombinants Video Lessons

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Problem: All the genes on a single chromosome are physically linked. wo genes are genetically linked if they segregate together in meiosis more frequently than they segregate separately. Two physically linked genes that always segregate together show complete genetic linkage. Two genes on the same chromosome that usually but not always segregate together are incompletely or partially linked.How can two genes be physically linked but not be genetically linked? Explain the phenomenon of incomplete linkage.

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Genetic linkage: the tendency of DNA sequences that are close together on a chromosome to be inherited together

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Problem Details

All the genes on a single chromosome are physically linked. wo genes are genetically linked if they segregate together in meiosis more frequently than they segregate separately. Two physically linked genes that always segregate together show complete genetic linkage. Two genes on the same chromosome that usually but not always segregate together are incompletely or partially linked.

How can two genes be physically linked but not be genetically linked? Explain the phenomenon of incomplete linkage.

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