Question

The number of linkage group in E.coli is/are
A. 4
B. 2
C. 1
D. 5

Answer 1

Hint: Linkage group in genetics referred to as all the genes on a single chromosome. As a group, they are inherited; that is, they behave and move as a unit rather than autonomously during cell division. In an organism, the total number of linkage groups equals the number of autosomes in its haploid cell.

Complete answer:
The most famous exception to Gregor Mendel’s Rule of Independent Assortment is genetic linkage. In 1905, the first experiment to prove connectivity was carried out. Later research showed that genes are physical structures connected by physical distance.
All the genes on a single chromosome are known as the Linkage group. As a group, they are inherited; that is, they behave and move as a unit rather than autonomously during cell division. The inclination of a trait to be linked to one sex is sex linkage.
In an organism, the total number of linkage groups equals the number of autosomes in its haploid cell. Escherichia coli are a haploid genus that carries a single molecule of DNA. Therefore, provided all the genes are mapped, the total number of linkage groups would be \[1\].
So, the correct answer is “Option C”.

Note:
When a chromosome splits, variation in the gene composition of a chromosome may occur. If it has split in the same locations, the pieces join with the partner chromosome. During meiosis, this gene exchange between chromosomes, called crossing over, typically occurs when the total number of chromosomes is halved. By checking the genetic linkage of already identified markers, linkage maps allow researchers to identify other markers, such as other genes.