Though mutations alter the genotype of an organism (genetic makeup), they do not necessarily change the phenotype of an organism.They may affect an individual gene or a whole chromosome.By modifying genes and alleles in a population, mutations result in genetic variation.Often these differences in gene sequences may be beneficial for an organism.A change in the DNA sequence is a mutation.In general, mutation is the primary source of genetic variation, which is the raw material for evolution through natural selection.However, there are other causes of genetic variation:.The main causes of genetic variation are:.What are the causes of genetic variation? These variations allow the animals in their habitats to better adapt to conditions.Albinism, cheetahs with markings, snakes flying, animals that play dead, and animals that resemble leaves are examples of genetic variation in animals.The modified leaves of carnivorous plants and the development of flowers that mimic insects to attract plant pollinators are examples of genetic variation in plants.All examples of genetic variations that can occur in a human population are the skin tone, hair color, dimples, freckles, and type of blood of an individual. Since conditions are unpredictable, genetically diverse populations may be able to adapt faster than those that do not involve genetic variation to evolving circumstances.For natural selection, genetic variation is important, because natural selection can only increase or decrease the frequency of alleles that already exist in the population.For instance, there is a high amount of genetic variation in a population of several different alleles at a single chromosome locus.The differences in genes or DNA segments are genetic variations and each variation of a gene is termed as an allele.The genetic variation of whole the species is usually termed as genetic diversity.A representation of the genetic differences that occur within a population is termed as genetic variation.Causes of genetic variation What is genetic variation?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |