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).
Which of the following are all factors that would increase genetic variation in a population?
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).
Which of the following would most likely increase genetic variation in a gene pool?
Gene duplication, mutation
, or other processes can produce new genes and alleles and increase genetic variation. New genetic variation can be created within generations in a population, so a population with rapid reproduction rates will probably have high genetic variation.
What could influence natural selection?
Four conditions are needed for natural selection to occur:
reproduction, heredity, variation in fitness or organisms
, variation in individual characters among members of the population. If they are met, natural selection automatically results.
What are the 3 types of genetic variation?
For a given population, there are three sources of variation:
mutation, recombination, and immigration of genes
.
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 are examples of genetic variation?
Genetic variation results in different forms, or alleles
?
, of genes. For example, if we look at eye colour, people with
blue eyes
have one allele of the gene for eye colour, whereas people with brown eyes will have a different allele of the gene.
Which is more likely to result in an increase of variation among organisms?
Sexual reproduction
can increase genetic variation but reduce species diversity. … Melian, “is that if sex increases genetic variation and speeds up evolution, then ecosystems will have a higher number of species that reproduce sexually.
How does population size affect genetic drift?
Small populations tend to lose genetic diversity more quickly than large populations due
to stochastic sampling error
(i.e., genetic drift). This is because some versions of a gene can be lost due to random chance, and this is more likely to occur when populations are small.
How does natural selection affect humans?
Probably more than you might think, a new study suggests. Natural selection
is still influencing the evolution of a wide variety of human traits
, from when people start having children to their body mass index, reports a study published Monday in the journal Proceedings of the National Academy of Sciences.
Is natural selection and survival of the fittest the same?
Evolution and “survival of the fittest” are
not the same thing
. Evolution refers to the cumulative changes in a population or species through time. “Survival of the fittest” is a popular term that refers to the process of natural selection, a mechanism that drives evolutionary change.
How do you explain natural selection?
Natural selection is the
process through which populations of living organisms adapt and change
. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.
What are 2 main sources of genetic variation?
Natural selection acts upon two major sources of genetic variation:
mutations and recombination of genes through sexual reproduction
.
How do you determine genetic variation?
Genetic variation can also be identified by
examining variation at the level of enzymes using the process of protein electrophoresis
. Polymorphic genes have more than one allele at each locus.
What is random genetic variation?
Genetic drift
describes random fluctuations in the numbers of gene variants in a population. Genetic drift takes place when the occurrence of variant forms of a gene, called alleles, increases and decreases by chance over time. These variations in the presence of alleles are measured as changes in allele frequencies.
What decreases genetic variation?
Two forces affecting genetic variation are
genetic drift
(which decreases genetic variation within but increases genetic differentiation among local populations) and gene flow (which increases variation within but decreases differentiation among local populations).
