What is the Importance of Gene Linkage ?


We study about linkage in our academic life and we sure do understand it like how it is transferred, how it links together, etc. but what be forget is to what is the importance of gene linkage ? Why is it so important to humans ? This is what we will be knowing about in this article.

What is the importance of gene linkage ?

Let's know about the importance of gene linkage:

  1. Linking of gene determines the nature and the characters in the hybridization and selection programmes. 
  2. There are reduced chances of recombination taking in the gene so the parental traits are passed on to the offspring as they are. It can be any kind of character racial or other. 
  3. It transfers the genetic material or the characteristics from our parents to us. 
  4. If we talk about sex linkage here is an example for it. A cow has 'xyz' trait in it which you want to carry forward you can selective breed the cow for that particular trait. 
  5. Gene linkage puts limits on the variability of the individual within themselves. 

What is linkage ?

There are two genes present on a chromosome, when they combine with each other is called linkage. There are numerous genes on the chromosomes and they all are linked each other which is said to be a linkage group.

 Linkage
Linkage

Types of linkage:

There are two types of linkage groups:-

Incomplete linkage:

The genes which can be separated by crossing over are called incompletely linked genes and this phenomenon where their inheritance takes place is called incomplete linkage. These genes are widely located on the chromosomes.

Complete linkage:

The genes which cannot separate by crossing over are called completely linked genes and this phenomenon where their inheritance takes place is called complete linkage. These genes are closely located on the chromosomes.

Types of sex linkage

Whilst the transfer of sex chromosomes with body characters of the offspring from its parents is called sex linked inheritance or sex linkage. There are two types of sex linkages:-

Incomplete sex linkage:

These genes are present on the homologous regions of X and Y chromosomes. Since crossing over can occur in these homologous regions they do not combine or inherit because of this they are called incompletely sex linked genes and this phenomena of inheritance is called incomplete sex linkage. Eg, colour blindness, nephritis, etc.

Complete sex linkage:

These genes are present on the non-homologous regions of X and Y chromosomes. Since crossing over does not take place in these regions they combine or inherit and these genes are called as completely sex linked genes and this phenomena of inheritance is called complete sex linkage. Eg, Haemophilia, Myopia, etc.

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