What is genetic variation? -(a) each individual in a population has slightly different genes. -(b) some individuals in a population have more genes than others. -(c) each population of a species has slightly different genes. -(d)some populations of a species have more genes than others.
1. Gene flow
2. Genetic drift by bottleneck effect
3. Bottleneck effect
4. Gene flow
5. Sexual selection
6. Founder effect
In population genetics, gene flow is often referred to as gene migration or allele flow. It involves transfer of genetic variation from a population to another population. If the level of gene flow is abundant in high quantity, then the two populations are regarded to have corresponding allele frequencies and can be considered to be a single population.
Genetic drift by bottleneck effect
The bottleneck effect is an extreme example of genetic drift that occurs when the amount of a population is seen to undergo a huge decrease. Certain situations like natural disasters (earthquakes, floods, fires, volcanic eruption) can swiftly reduce a population, leading to the death of a lot of indviduals with a minimal number of random assortment of survivors.
This is a sharp decline of a population's gene pool due to an environmental, or human-influenced, change
Sexual selection is a kind of natural selection where members of one biological sex prefer to copulate with mates of the other sex to mates of its own sex. It is a form of intersexual selection, and compete with its own sex members over the opposite sex members.
The founder effect is a decline in genetic variation that occurs when a little subset of a large population is employed to set up a new colony. It often times is involved in the emergence of new species.
A is the answer to the question
1. ) B- these species share a common ancestor
2. ) B- it ensures that only the biggest and strongest organisms survive
3. ) C- vestigial
4. ) B- some of the bacteria may be resistant and survive
5. ) C- mitosis
6. ) A- a caterpillar changing into a butterfly
7. ) B- adaptation
8. ) C- become more common in the future
9. ) D- comparison of experiences from each organism
10. ) B- a physical barrier may arise and separate a population, preventing interbreeding
11. ) C- giraffes that have longer necks survive a dry season by eating leaves from the tops of trees. Those giraffes breed more successfully that year
12. ) D- gene pool
13. ) C- a change in the DNA produces a variation within the gene
14. ) A- a change in a population over time
15. ) C- reproduce successfully
I just took the test and got a 100%
just took the test the correct answer is all genes of all of the individuals in a specific population.
Evolution may be defined as the change in the species with respect to time. New characters are involved in the species according to their habitat and feeding habits of the species.
The contradictory gene tree can be solved by the study of evolutionary tree. The low plating gene might have single origin in the oceanic population. These genes remains in the low frequency but after the colonization of lakes, the genes fixed independently in each population.
Thus, the correct answer is option (e).
The correct answer is option D. "A single origin of the low plating gene in the oceanic population that remained at a low frequency until lakes were colonized. Then the gene independently became fixed in each".
In this example, the adaptation of low platting in Stickleback fish made difficult to establish a clade based on the gene responsible of this trait, because the analysis with other genes suggest that the genes evolved independently. The scientists resolved the contradictory gene trees by suggesting the existence of a single origin of the low plating gene in the oceanic population that remained at a low frequency until lakes were colonized. Then the gene independently became fixed in each. This explains why the fish share the gene, and gives a coherent explanation of how an external factor (colonization) affected the genetic linage of this trait.
this is to long! can u give me a outline of the question and ill give you the answers then