What is the variation that exists among species?
What is the variation that exists among species?
genetic diversity
The genetic variation of an entire species is often called genetic diversity. Genetic variations are the differences in DNA segments or genes between individuals and each variation of a gene is called an allele.
Is there more variation within a species or among species?
The variation among different populations of the same species is generally not significantly less than the differences observed among species (like in the situation depicted right of Figure 1).
What are sources of variation within species?
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 3 types of variation?
Examples of types of variation include direct, inverse, joint, and combined variation.
What allows for variation within the human species?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
What are some examples of variation in a species that has allowed it to survive?
An example would be moths of the same species with different color wings. Moths with wings similar to the color of tree bark are better able to camouflage themselves than moths of a different color. As a result, the tree-colored moths are more likely to survive, reproduce, and pass on their genes.
What are the 5 sources of variation?
What are the 5 types of variations?
Why are variations essential for the species?
Answer: Variations are important for species survival because variation causes the organism to overcome extreme situations. Organism species occupy well-defined positions in the ecosystem, utilizing their reproductive capacity.
How does genetic variation occur in a species?
Genetic variation within a species can result from a few different sources. 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.
Why are there differences between individuals in the same species?
These differences are called variation. As we have not yet learned about cells and DNA, this chapter will not look at the genetic basis for variation, but rather focus on the fact that there are differences between individuals in the same species, and that some of those characteristics are inherited (passed down from one generation to the next).
How is variation generated in a gametic cell?
Variation is constantly being generated by mutation, errors in the replication of the genome of an individual. If a mutation occurs in the gametic cells, it affects the genotype of the offspring. By affecting the genotype, it may or may not have a discernable effect on the phenotype.
Which is a defining characteristic of a species?
A species is a group of organisms that can interbreed with each other to produce fertile offspring. In this section you will learn why the ability to create a fertile offspring is the single most defining characteristic of a species. Wherever organisms in a species live, they need to survive in those conditions.
