FACTORS THAT CAUSES GENETIC VARIATION
Genetic variations are those genetic differences that occur naturally within same set of species or different set of species in a population. This variation allows for flexibility and survival of the population in the ever harsh changing environmental conditions. Often times this is an added advantage as new breed of species springs up but often times these variations allow for competitions making these species prepare for the unexpected. But one important question to be asked is if these variations brings about a supposedly increase or decrease of species?
Factors which affects genetic variations includes the following;
IMPORTANCE OF MATING PATTERNS
This is important as mating allows for new set of breeding species. Mating could either be done with same species or different species in the same community. When there is interbreeding in a given set of populations, mating non randomly could occur because a particular species may decide to mate another specie based on certain trait. When this happens, certain changes in behaviour are observed, and these behaviours shape the genetic combinations that successfully appear in other generations. When this happens, the pattern of mating in that population are no longer random.
These forms of non random mating occurs differently in two different forms each having different consequence. One type of this type of mating is inbreeding. Inbreeding is a form of mating that occurs when individuals which have same or similar genotypes are more likely to mate with each other than individuals having different genotypes.
The other type of mating is known as out breeding. This occurs as a result of individuals with a particular genotype mating with individuals of another particular genotype. Consequent of inbreeding is that it causes a decrease in population variations while out breeding causes increase in population variations.
FORCES WHICH RANDOMLY LEAD TO GENETIC CHANGE
This is made possible by changes in environmental factors, change in population variations, and change in alleles of a given population. These changes which are called genetic drift either decrease or increase as time goes by.
This genetic drift often occurs in small populations where alleles that in frequently occur face a higher chance of being lost. When this begins, there will be a continuous genetic drift until the allele involved is lost either by population or the allele present only at a particular gene is lost within a particular population. These factors either decrease the genetic diversities in the given population.
This is a way of genetic alleles are distributed in a given population. If different alleles lives differently from each other, there will be an uneven distribution of genetic components. If also there is an intermixing of different genetic individuals with different alleles in same population, there will be an unequivocal genetic distribution of alleles making interbreeding more successful and breeding new and different species in the process.
Migration is the movement of organisms from one place to the other to attain genetic status. Migration used in the scope of context means the migration of individuals out of or into genetic environments. If the migrating alleles stay back and migrate with existing species, then they can provide a new breed of alleles with a sudden influx of alleles. After mating has been concluded between the migrating and staying individuals, the migrating individuals contributes alleles different from the staying ones which eventually alter the existing alleles in its given population.
Genetic variations in a population are gotten from a wide range of assortment of alleles and genes. The population changes experienced is a result of persistence through changing environments over time which depends on their adaptive capacities to the changes in their external environment. When an allele is added into a given population, it makes the new allele added survive better also if its added into the population, it sometimes loses its survival capacities.