Genetic analysis of behavior - Methods of behavioral genetics
6 important questions on Genetic analysis of behavior - Methods of behavioral genetics
How can environmental influence on a certain behavior be ruled out during research?
By keeping and investigating different induviduals in exactly the same environmental conditions.
Behavioral genetics use different methods to identify if a certain behavior is caused by genes or environmental triggers, what are these methods?
- Inbreeding
- Artificial selection
- Inducing mutations and screening for change in behavior
- Finding natural variants and looking for genetic differences
- Hybridization
How does artificial selection proof a certain behavior has a genetic basis?
In artificial selection, only induviduals expressing a certain trait are allowed to reproduce, if the trait is caused by genetics this (behavioral) trait becomes more common and more exagerated, of course this is only certain if the induviduals are all kept in the same conditions. Different dog breeds are a good example of the result artificial selection can have on a species.
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Is it possible for two different strains bred to express the same trait to contain genetic differences? What does the anwer to this question suggest?
Yes it is possible, this suggests that is possible for natural selection to take different paths in different populations to produce the same adaptive behavior.
How can a mutation be induced?
Agents can change the DNA bases and therefore change the gene's instructions for producing a protein.
How does inducing mutations and screening for change in behavior work?
By exposing induviduals to mutegenic agents their DNA bases are changed, and therefore they will probably code for other proteins. Some of the induviduals become behaviorally different. These different induviduals are seperated from the normal induviduals. Appropriate genetic crosses can then determine whether the behavioral change is caused by an alteration in a single gene.
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