Question

Over the last several decades, the scientific community has gathered a large amount of information regarding genetics and genetic variation. What are two main sources that lead to increased genetic variation?

Selective breeding

Gamete mutations

Recombination

Genetic drift

I have looked all in my notes and can't find anything on this topic.

Answer 1

http://faculty.evansville.edu/de3/b10004/PDFs/13b_Sources_variation.pdf

Answer 2

The ultimate source of genetic variation in populations is via MUTATION.

Genetic Drift

Genetic drift—along with natural selection, mutation, and migration—is one of the basic mechanisms of evolution.

In each generation, some individuals may, just by chance, leave behind a few more descendents (and genes, of course!) than other individuals. The genes of the next generation will be the genes of the “lucky” individuals, not necessarily the healthier or “better” individuals. That, in a nutshell, is genetic drift. It happens to ALL populations—there’s no avoiding the vagaries of chance.

http://evolution.berkeley.edu/evosite/evo101/IIIDGeneticdrift.shtml


Genetic Variation

Without genetic variation, some of the basic mechanisms of evolutionary change cannot operate.

There are three primary sources of genetic variation, which we will learn more about:

Mutations are changes in the DNA. A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations.

Gene flow is any movement of genes from one population to another and is an important source of genetic variation.

Sex can introduce new gene combinations into a population. This genetic shuffling is another important source of genetic variation.


http://evolution.berkeley.edu/evosite/evo101/IIICGeneticvariation.shtml

Answer 3

Thanks! That was helpful :) @dejavu_april0415

Answer 4

You're welcome!

Answer 5

They're probably talking about medication.Irradiating food is meant to kill bacteria, not mutate them. Vaccines prevent acquired diseases, not genetic ones. Adaptation to resist pesticides isn't a new discovery, just more and more common. Genetics can predict what diseases an individual will be susceptible to and which of a choice of medicines will be more effective (especially for cancer, which is an accumulation of mutations).

Answer 6

lol are you doing advanced academics too ? sucks..

Answer 7

Gamete mutations and
Recombination