How does having different alleles cause variation in a population?

What causes genetic variation in a population?

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

What does it mean to have a variation in a population?

Genetic variation in a population describes the existence in that population of different alleles, or alternative forms, for a given gene. The presence of genetic variation implies that individuals of the population vary in the alleles they possess, meaning that individuals differ in genotype.

What are the 3 causes of 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.

What are the two main sources of genetic variation?

Natural selection acts upon two major sources of genetic variation: mutations and recombination of genes through sexual reproduction.

What is multiple alleles explain with the help of an example?

Multiple alleles refer to the occurrence of three or more than three alleles for a particular gene. Alleles are different or contrasting forms of a gene. For example, for the gene encoding for height, one allele can be for tallness, whereas the other can be for dwarfness.

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When genes have more than two alleles that affect the trait?

The majority of human genes are thought to have more than two normal versions or alleles. Traits controlled by a single gene with more than two alleles are called multiple allele traits. An example is ABO blood type.

Multiple Allele Traits.

Genotype Phenotype (blood type)
IAIB AB

What variation means?

1 : a change in form, position, or condition Our routine could use some variation. 2 : amount of change or difference Scientists record the variations in temperature.

What are examples of variations?

For example, humans have different coloured eyes, and dogs have different length tails. This means that no two members of a species are identical. The differences between the individuals in a species is called variation.

What is variation in a community?

A community changes when its constituent species change and/or when the frequency of species changes over time. … It represents the change in the total or average phenotype of the ecosystem that can be explained by variation in fitness within species.