: the distance between two genes in a chromosome is measured in cross-over units which represent 1. Ratio of crossing over between them 2. Percentage of crossing over between them 3. Number of crossing over between them 4. None of these.
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When genes are found on different chromosomes or far apart on the same chromosome, they assort independently and are said to be unlinked.
When genes are close together on the same chromosome, they are said to be linked. That means the alleles, or gene versions, already together on one chromosome will be inherited as a unit more frequently than not.
We can see if two genes are linked, and how tightly, by using data from genetic crosses to calculate the recombination frequency.
By finding recombination frequencies for many gene pairs, we can make linkage maps that show the order and relative distances of the genes on the chromosome.
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