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Unformatted text preview: stances between
them along a chromosome
The probability of a crossover occurring between
two genes increases with the distance separating
student of morgan’s A.H. Sturtevant proposed that the percentage of
recombination, or recombination frequency (RF),
could be used as a gauge of the physical distance
between any two genes on the same chromosome
1% RF = 1 centimorgan (cM) = 1 map unit (m.u.)
47 Recombination frequencies provide
the basis of genetic mapping 48 Experimental recombination frequencies
between two genes are never greater
than 50% 49 Recombination frequencies of 50% between two
genes indicates the genes are either not on the
same chromosome or are at a great distance from
each other on the same chromosome.
In this case, one way to determine if the genes are
on the same chromosome is to show linkage with
other genes that lie between them. 50 Next topic
pp 141-148 51...
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This document was uploaded on 02/25/2014.
- Winter '14