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I'm not sure if there are even two, but in my view I think firstly the change in traits occurs when reproduction takes place and the gametes of each parent combine their genes and exchange through a process called "cross-over" here some new genes of the individual themselves start to form.
Secondly, don't take my word for it, but mutations may also cause a change in the human gene. The same way proteins get denatured our DNA also is influenced by some environematl effect.
Example: Albino people and other species.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoNatural Selection and mutations
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Why does natural selection depend on variations and DNA?
The variations in the DNA are responsible in differences between desirable traits and unwanted traits. Mutations also cause changes in the DNA.
Which of these was part of Charles Darwin's theory?
Genetic recombinations of DNA cause variations of genetic traits .
Which probably causes the coat color variations that occur only in the females of a certain animal?
There are a few things that might cause coat color variations that occur only in the females of a certain animal. These traits are sex-linked on the chromosomes.
How does environmental pressure affect natural selection?
When nothing happens to exert strong population pressure on that population, natural selection favors the allele frequency already present. When mutations cause new traits, natural selection weeds these traits out because they're not as efficient as the others.
How do mutations relate to traits?
Mutations cause certain traits.
How differences in genotypes cause variations in phenotypes?
Phenotypes are the traits expressed by the genotype. So, for blood type, a person can have A and i alleles (genotype). However, in the phenotype, since i is recessive, only the A will be expressed, and the person will have an A blood type.
What factors might be responsible for variation in measurements of traits such as the heights of 10yrs old pine trees or the kidney filtration rates of 10 replicate lab mice?
genetics, evolution, and natural selection can be the cause of variations.
What is the major cause of variation within species?
sexual reproduction is the major cause of variations within a specie
Do mutations in genes affect traits?
Genes produce proteins that cause traits.
Why do mutations in gene affect traits?
Genes produce proteins that cause traits.
Which best describe how genes control traits in an organism?
Genes are codes for proteins that cause traits.
What Variations in air pressure from place to place are the principal cause of?
clouds
