Your question: What are the two causes of phenotypic variation?

Two types of factors are recognized as contributing to the phenotypic variation in a population, genetic and environmental.

What are the causes of phenotypic variation?

Phenotypes can be caused by genes, environmental factors, or a combination of both. Phenotypic variation, then, is the variability in phenotypes that exists in a population. For example, people come in all shapes and sizes: height, weight, and body shape are phenotypes that vary.

What are the two types of phenotypic variation?

The phenotypic variation in populations is the result of genetic variation and two nongenetic sources of variation, namely, environmentally induced variation (EIV) and stochastic developmental variation (SDV).

What are the 2 causes of variation?

Major causes of variation include mutations, gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.

What are the three main sources of phenotypic variation?

Overall, the main sources of genetic variation are the formation of new alleles, the altering of gene number or position, rapid reproduction, and sexual reproduction.

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What causes increased phenotypic and genetic variation?

Because natural selection acts directly only on phenotypes, more genetic variation within a population usually enables more phenotypic variation. Some new alleles increase an organism’s ability to survive and reproduce, which then ensures the survival of the allele in the population.

What causes phenotypic plasticity?

Rather, phenotypic plasticity is a developmental process, and the reaction norms that we usually measure in the adult stage, or at reproductive maturity, are in fact the result of a positive feedback between environments and genes throughout the ontogeny of an organism (Schmalhausen, 1949; Smith-Gill, 1983; Pigliucci …

What environmental factors can cause phenotypic variation in animals?

Environment Can Impact Phenotype

Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all impact which of an animal’s genes are expressed, which ultimately affects the animal’s phenotype.

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 causes stabilizing selection?

Simply stated, there is no common cause of stabilizing selection, besides the fact that the most average individual is selected for. In that way, like all forms of selection, the cause of stabilizing selection is the increased fitness and reproductive success that the median individuals have.

What are the 3 types of variation?

Organisms show:

  • Genetic variation – the variation in genotypes (i.e. the genes) between species or within a species.
  • Phenotypic variation – the variation in phenotypes other features apart from the genes) between species or within a species e.g. variation in height, mass, shape, colour, blood type.
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What are the 4 types of variation?

Examples of types of variation include direct, inverse, joint, and combined variation.

What is an example of a common cause variation?

Common Cause Variation Examples

Consider an employee who takes a little longer than usual to complete a specific task. He is given two days to do a task, and instead, he takes two and a half days; this is considered a common cause variation.

Why variation in genotype causes variation in phenotype?

Variation within genes leads to different genotypes , which can be seen by the individuals having different phenotypes . … Genetic and environmental variation combine together to produce these different phenotypes. All genetic variants arise from mutations .