TLS Online TPP Program

#Id: 8953

#Section 3: Genetics, Cellular and Molecular Biology

A third way that gene duplicates arise is by retrotransposition.

Here the messenger RNA from a gene is reverse-transcribed to DNA, which is then integrated into the genome.

TLS Online TPP Program

#Id: 8954

#Section 3: Genetics, Cellular and Molecular Biology

As a chromosome with a new gene duplicate spreads through a population, there is polymorphism in the number of copies of the gene that individuals carry. This situation, called copy number variation.

TLS Online TPP Program

#Id: 8955

#Section 3: Genetics, Cellular and Molecular Biology

TLS Online TPP Program

#Id: 8956

#Section 3: Genetics, Cellular and Molecular Biology

Mixtures of exons duplicated from genes with different functions can generate new genes with new functions, a process that is called exon shuffling.

TLS Online TPP Program

#Id: 8957

#Section 3: Genetics, Cellular and Molecular Biology

Gene duplication happens on a massive scale when whole genome duplication occur. whole genome duplication are two type, 

1.Autopolyploid

2.Allopolyploid

TLS Online TPP Program

#Id: 8958

#Section 3: Genetics, Cellular and Molecular Biology

Genetic exchange also happens between distantly related organisms by horizontal gene transfer, or HGT.

HGT is particularly important to prokarytotes and is the most common way by which they acquire new genes.