Answer:
1. Mutation- increase genetic variation
2. Selection- may increase, decrease or maintain genetic variation
3. Genetic drift- decrease genetic variation.
4. Gene flow- may increase or decrease genetic variation
Explanation:
1. A mutation refers to the changes in the DNA in an organism. The mutation of genes in DNA produces new adaptive features to evolve which increases the genetic variation of the organisms.
2. The natural selection favors the species which are best suited to live in that natural conditions. The natural selection, therefore, may increase or decrease the variation in a population.
3. Genetic drift is the phenomenon occurs due to random event which changes the gene pool of the population. When the genetic drift phenomenon is observed than the genetic variation of that population usually decreases.
4. Gene flow is the phenomenon in which the gene pool changes die to immigration and emigration. Therefore the phenomenon may increase or decrease genetic variation.
The relationship in human hair alleles is that of incomplete dominance whereby allele of a specific trait is not fully expressed over it paired allele. By crossing any two wavy haired humans all the air type which is obtained is hairy. Crossing straight haired and wavy-haired man will produce one curly is to one straight is to one wavy. She is faithful.
Amoebas are single-celled organisms, which means that they are composed of just one cell. Each amoeba is a cell capable of performing all living functions by itself. They can reproduce asexually. They are protozoans with no fixed shape. Most have no hard parts and look like blobs of jelly.
The technique that uses an enzyme to replicate DNA regions from a small sample of DNA is called <span>PCR (polymerase chain reaction) analysis</span>. The answer to your question is B. I hope this is the answer that you are looking for and it comes to your help.
