Table of Contents
How does genetic variation affect phenotype?
Genetic differences or variation between individuals leads to differences in an individual’s phenotype, trait or risk of developing a disease. These are called complex phenotypes and may be influenced by multiple variants in the genome along with environmental factors.
What factors influence phenotypic variation?
Two types of factors are recognized as contributing to the phenotypic variation in a population, genetic and environmental.
What causes phenotypic diversity?
Phenotypic variations may be caused by differences in long-term programming of gene function rather than variation in gene sequences per se, and studies of the basis for inter-individual phenotypic diversity should consider epigenetic variations in addition to genetic sequence polymorphisms.
Is phenotype influenced by genotype?
The term “phenotype” refers to the observable physical properties of an organism; these include the organism’s appearance, development, and behavior. An organism’s phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes.
Why are polymorphisms so important to phenotypic variation?
It is a special aspect of genetic variation because it connotes segregation of relatively common variants within populations and also implies the presence of some evolutionary mechanism(s) for their maintenance.
What are the components of phenotypic variation?
Phenotypic variance, usually combines the genotype variance with the environmental variance. Genetic variance has three major components: the additive genetic variance, dominance variance, and epistatic variance.
What is phenotypic diversity?
Phenotypic variation in humans is a direct consequence of genetic variation, which acts in conjunction with environmental and behavioral factors to produce phenotypic diversity. Genetic variants are classified by two basic criteria: their genetic composition and their frequency in the population.