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1. Why is crossing over between two genes on the same chromosome from 0% to 50%, and not
higher?
2. Why is linkage between two genes on the same chromosome from 50% to 100%, and not
lower?
Solution
They are so far apart on one chromosome that there is
a 100% likelihood of a crossover occurring between them
- 50% recombination frequency because only half the chromatids are involved in a crossover
event (except rare cases)
Because crossing over occurs at the 4-strand stage of the cell cycle (that is, after S phase) so that
each single crossover involves only 2 of the 4 chromatids. So 50% parental chromatids are
produced and 50% crossover chromatids are produced.
Genetic linkage: genes located on same chromosome may be inherited together in genetic
crosses

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1. Why is crossing over between two genes on the same chromosome fro.pdf

  • 1. 1. Why is crossing over between two genes on the same chromosome from 0% to 50%, and not higher? 2. Why is linkage between two genes on the same chromosome from 50% to 100%, and not lower? Solution They are so far apart on one chromosome that there is a 100% likelihood of a crossover occurring between them - 50% recombination frequency because only half the chromatids are involved in a crossover event (except rare cases) Because crossing over occurs at the 4-strand stage of the cell cycle (that is, after S phase) so that each single crossover involves only 2 of the 4 chromatids. So 50% parental chromatids are produced and 50% crossover chromatids are produced. Genetic linkage: genes located on same chromosome may be inherited together in genetic crosses