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The distance between two genes in a chromosome is measured in cross-over units which represent
Ratio of crossing over between them
Percentage of crossing over between them
Number of crossing over between them
None of these
Solution
(b) The cross over percentage differ for different pairs of genes because the amount of crossing over depend on the frequency with which breaks in the chromatids occur between the two genes.
This frequency further depends specially on the distance of these genes which are apart on the chromatids.
Similar Questions
In a certain plant, red flowers $(R)$ are dominant to white flowers $(r)$ and tallness $(T)$ is dominant to dwarfness $(t)$. A heterozygous plant $(RrTt)$ is backcrossed with a double recessive plant $(rrtt)$. If the gene loci for colour and size and situated very close together on the same chromosome, the expected percentage of offsprings could be approximately
|
tall red |
tall white |
dwarf red |
dwarf white |
respectively
