Question

The mechanism that causes a gene to move from one linkage group to another is called as?
a. Translocation
b. Crossing over
c. Inversion
d. Duplication

Answer 1

The mechanism refers here is the movement or the transfer. Hence, it will cover the location, separation and arrangement of the chromosomes. It is the separation of chromosome and its union to a non-homologous chromosome.

Complete answer:

Option A:
Translocation is the process of movement of genes of one linkage group to that of another group which occurs due to an induced abnormality. It is part of an irregular maintained cycle. This is the correct statement in context to the mechanism causing movement of the gene.

Option B:
Crossing over is the process that results in the exchange of genes between two homologous chromosomes. It is the process during meiosis helping in recombination. Thus, it is an incorrect choice.

Option C:
Inversion is the process of rearrangement of genes on the same chromosomes. Thus, it covers no transfer from one gene to another and hence can’t be called a transferring mechanism. It is an arrangement mechanism.

Option D:
Duplication is also the rearrangement of genes on the same chromosome. This leads to the change in the order of genes within the same linkage group. Hence, this is also an inaccurate choice.

Hence, the correct answer is option (A).

Additional information:
Translocation means a change in the location. It is a part of the chromosome that is transferred to another chromosome. The chromosomes are the units of heredity. The translocation usually causes flaws in chromosomes.

Note: Linkage groups refers to the number of types of chromosome present in species, We humans have 22 linkage groups and one X and one Y group. Rearrangement between two non - homologous groups is defined as the translocation. It is not a normal process that usually occurs in irregular conditions.