The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by
T.H. Morgan
Gregor J. Mendel
Alfred Sturtevant
Sutton Boveri
When two genes are situated very close to each other in a chromosome
There are three genes $a,\,b,\,c$. Percentage of crossing over between $a$ and $b$ is $20\%$, $b$ and $c$ is $28\%$ and $a$ and $c$ is $8\%$. What is the sequence of genes on chromosome ?
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
Frequency of crossing over in a chromosome is an index of
Crossing over causes