Genetics
What map unit(Centimorgan) is adopted in the construction of genetic maps?
The first attempt to show linkage in plants was done in
Every individual organism bears several heritable characters which are represented by the innumerable genes present on the chromosomes. During meiosis, the chromosomes move into the gametes as units, all the genes present on any given chromosome will segregate as a group and move together from generation to generation. This tendency of the genes located on the same chromosome, to stay together in hereditary transmission, is known as linkage. The genes located on the same chromosome are called as linked genes.
The principle of linkage was discovered by Bateson and Punnet in 1906 in the sweat pea, plant, Lathyrus odoratus. However, linkage, as a concept was put forth by Thomas Hunt Morgan in 1910 based on his experiment on Drosophila melanogaster.
What map unit(Centimorgan) is adopted in the construction of genetic maps?
Percentage of recombination between A and B is 9%, A and C is 17% and B and C is 26%. The arrangement of genes would be
In maize, coloured endosperm (C) is dominant over colourless (c) and full endosperm (R) is dominant over shrunken (r), When a dihybrid of F$$_1$$ generation was test crossed it produced four phenotypes in the following percentage: Coloured-Full = 45%, Coloured-Shrunken = 5%, Colourless-Full = 4% Colourless-Shrunken = 46% From these data what would be the distance between the two non-allelic genes?
The linkage map of X chromosome of fruit fly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be
How many linkage groups are there in nucleoid of bacteria?
If distance between genes on chromosome is more, then gene shows
In a genetic map, distance between P and Q is 12.4 map unit, Q and R is 7.6 map unit and P and R is 18.2 map unit instead of 20 map unit. This is because of
Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybrid, the F$$_2$$ segregation will show