Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
There are particular factors that cause the diversity in a gene pool to change.
For each of the following statements, select the correct factor from the menu on the attached picture that is being described.
- The process by which organisms with certain heritable traits survive, passing on their traits to the next generation; determined by the environmental conditions of the time
- A change in allele frequencies caused by chance events in a small gene pool
- The movement of alleles into or out of a population by immigration or emigration
- The process of choosing mates based on the presence of certain traits or
phenotypes and, thus, genotypes; traits are usually displayed in some form of courtship ritual - A type of genetic drift that occurs when a natural disaster thins the population to a small group that happens to be unrepresentative of the original group; allele frequencies of the two groups will be dissimilar
- A type of genetic drift that occurs when a small population that is not representative of the main population migrates away; allele frequencies of the two groups will be dissimilar
- The process of organisms moving from one place to another
- A permanent change in a cell’s DNA that has the potential to affect an entire gene pool
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