Question

A linkage group is defined as
A. All the linked genes of a chromosome pair
B. Different groups of genes present on different chromosomes
C. All the genes located on the same chromosome
D. None of the above

Answer 1

Genes are nothing but some sequence of the DNA, which are present on the chromosomes and each chromosomes has genes, where each gene has a pair of alleles, that represent the traits and all the ends together called as genotype, where the expression of this genes physically are called as phenotype.

Complete answer: A linked group or genetic linkage is defined as the group of genes or DNA sequences that are located on the chromosome more closely so that they are not broken, and this closely related gene is inherited as a group rather than individual.
As we know that Mendel proposed so many laws, among them law of independent assortment, where the genes are inherited individually, so these linked genes are exceptional to the law of independent assortment of Mendel's law.
Even during meiosis, generally chromosomes undergo cross over, where and undergo recombinations and during this process also, genes are recombined as a link, as they are less physical distance present between them, and the distance between the Gene’s are given by the measurement called Centimorgan.
So the inheritance of individual genes is relatively less when the genes are linked together as genetic linkage.
In some species this genetic linkage is shown by genetic map, where it shows the distance of frequent or known genes.

So the correct option Is A.

Note:
The genes that are present on the chromosomes which are linked to each other and these genes even when inherited also they cannot separate, which means the inherent as linked genes only where they won’t separate during the cell division.