What is phenotypic and genotypic variation?
Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation).
What does phenotypic variance mean?
the amount of variation in a phenotypic trait amongst individuals in a population.
How do we calculate variance?
The variance for a population is calculated by:
- Finding the mean(the average).
- Subtracting the mean from each number in the data set and then squaring the result. The results are squared to make the negatives positive. …
- Averaging the squared differences.
What are the components of genotypic variance?
Genetic variance has three major components: the additive genetic variance, dominance variance, and epistatic variance.
What is an example of phenotype?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
What are the causes of phenotypic variation?
Phenotypic variation occurs when the expression of genes is changed in response to the environment, for instance by the induction or repression of synthesis of particular enzymes.
What are the three main sources of genetic variation?
For a given population, there are three sources of variation: mutation, recombination, and immigration of genes. However, recombination by itself does not produce variation unless alleles are segregating already at different loci; otherwise there is nothing to recombine.
Why additive variance is fixable?
Ans. It refers to interaction between two or more loci, each exhibiting lack of dominance individually. It is denoted as A x A and is fixable. It comes under additive gene action.