Question

Explain one advantage and one disadvantage of genetic admixture between isolated populations .

IBD can be used (with additional modelling) to estimate genetic admixture. What do the length and frequency of IBD regions tell you (4 marks, 4-6 sentences max)?

Answer 1

Ans1. Genetic Dmixture is defined as the mixing of genes between to the two isolated population because of inter breeding i.e.  separate populations of the same species bred from different genetic lines

Advantage:It leads to evolution because of introduction of new genes and causing genetic variation. This helps in masking lethal ( deletirious) gene mutations . also, it has important role in evolving during biological invasion and adapting to he new environment.

Disadvantage : Inbreeding within the same population can lead to INBREEDING DEPRESSION i.e. loss of hybrid vigour / reproductive capacity and the ability to adapt to the changing conditions.

therefore, admixture helps in lifting the inbreeding depression.

Ans 2. IBD ( Identity By Descent)  underlies genetically mediated similarities among relatives. Gene IBD is traced through ancestral meioses and is defined relative to founders of a pedigree, or to some time point or mutational origin in the coalescent of a set of extant genes in a population.

The length and frequency of IBD regions tell us about the amount of similarity and helps in tracing the common ancestor