Genetic variation is important because a population has a better chance of surviving and flourishing than a population with limited genetic variation. Genetic diversity also decreases the occurrence of unfavorable inherited traits.Know More
Genetic variation comes from mutations within DNA; the movement of genes from one population to another, or gene flow; and new genetic combinations resulting from sex. When a population contains genetics of individuals who vary significantly, some of the individuals in the group can possess traits that make them resistant to disease or cold, increasing the group's chance for survival when these individuals breed with the others. A small, isolated population's individuals may be forced to breed with close relatives, increasing the occurrence of genetic flaws. When inbreeding occurs, any genetic weaknesses found in the parents can be multiplied in future generations.
Genetic variation also helps organisms survive in different climates and environments. If the environment is unpredictable over time and includes a variety of diseases and predators, some differences among individuals increase the chances of some individuals surviving to reproduce, while others do not. In disease resistance, genetic diversity is important because a disease can decimate a homogeneous population in which all the individuals are equally susceptible to the disease.Learn more about Molecular Biology & DNA
The genetic code is important because it provides instructions for protein synthesis. All organisms on Earth utilize proteins in chemical reactions to facilitate physiological functions. Differences in genetic code result in different proteins, and thus different genetic variations in organisms.Full Answer >
Genetic drift is more likely to occur in small populations because when a mutation arises in a member of such a population, they, and potentially their offspring, constitute a much larger proportion of the population than a mutated individual would be in a larger population. As their offspring interbreed with others, the new trait is much more likely to become widespread. A larger population would tend to drown out mutations.Full Answer >
The disadvantages of cloning include increased risk of inherited diseases, lack of gene variation, ethics and religious dogma associated with it. The term cloning refers to a number of processes used in producing genetically identical copies of a biological entity.Full Answer >
Genetic manipulation, also called genetic engineering, refers to the alteration of the genes of an organism. It involves manually adding new DNA to an organism to add new traits. Examples of genetically engineered organisms include plants that are resistant to certain insects, plants that tolerate herbicides and crops with altered oil content.Full Answer >