ipl-logo

Bottleneck And Founder Effects Of Genetic Drift

260 Words2 Pages
bulb-icon

Recommended: Darwins theory of natural selection

Genetic drift has two types the bottleneck and founder effects. With the bottleneck effect the one generation of a species is reduced so that genetic variations can take effect more quickly. One example of bottleneck is the Northern elephant seal that was hunted by humans in the late 1800’s. They were almost extinct but have made a small comeback. They still have marks of the bottleneck; however the southern elephant seal has much less genetic variation because they were not hunted as much. Another way to describe bottleneck is when a catastrophe strikes and kills off most of a population it must be all of a sudden. It must kill individuals irrespective of the genes. Natural selection happens only when a portion of the population without certain
Show More
Related
402 Words | 2 Pages

For instance, forks accounted for 33% of the population while spoons accounted for 67% of the population---knives were once again extinct by the second generation (Table 2A). In the third generation, spoons accounted for 100% of the population (Table 2A). As for prey in the grass habitat, in the second generation, black beans accounted for 16.58% of the population while, green beans accounted for 27.69%, white beans accounted for 29.35% and pinto beans accounted for 26.37% of the population (Table 2B). In figures 4A and 4B, it is easier to note the changes in percent population since the three generations and the final percent of population (after the three generation) are

Read More
1594 Words | 7 Pages

Their behaviors towards abiotic factors have changed, because the factors have changed themselves. For example, their predators have stayed the same, but their food availability have changed because of the changing climate. Competition has also dramatically changed as they are an endangered species. The climate

Read More
877 Words | 4 Pages

Paragraph 1: Introduction - explain your lab. The lab that I chose to do was the “McGraw Hill Higher Education: Natural Selection - Virtual Lab.” I chose this lab because it was the one that most interested me, as I liked the format of the virtual lab. In this lab, I was able to manipulate both the environment and the allele frequency in order to record and investigate the generational breeding patterns of a group of organisms.

Read More
1173 Words | 5 Pages

The film Alambrista (1977) by Robert M. Young is a film about a young Mexican man, Roberto who lives in Mexico. His daughter is born at that the beginning of the film, which prompts him to illegally cross the border to the United States in order to obtain money for his family. He finds work, but it is extremely demanding and backbreaking with very little pay or benefits. To make matters worse, he doesn’t know any English, which causes him to stand out. He eventually finds help and kindness with a young American waitress.

Read More
927 Words | 4 Pages

1. Explain why evolution often selects traits that promote genetic diversity. Evolution often selects traits that promote genetic diversity because genetic diversity boosts the chances that at least some members of the population will have a combination of traits that will allow them to survive and reproduce in a changing environment. Organisms that rely on asexual reproduction have virtually identical offspring, and they are successful in a stable environment; however, conditions rarely remain constant on Earth.

Read More
530 Words | 3 Pages

In directional selection, one extreme trait is favored over the mean trait or other extreme trait; and this occurs in environments that have undergone changes over time. Changes in terms of climate, weather and food availability are the driving forces for this type of natural selection. If shown on a graph, the population bell curve shifts either farther left or farther right, indicating that one trait, is favored over another for a species. An example of this type of natural selection is the beak length of the Galapagos finches, which changed through time due to changes in food availability. Those with larger and deeper beaks survived the scarcity of insects since they were able to crack seeds.

Read More
2097 Words | 9 Pages

Do dreams have an evolutionary function? In this essay I will discuss Flanagan’s reasons for believing consciousness is an adaptation, I also will discuss why sleep is an adaptation and his stance on dreams being spandrels. And I will end with my opinion on why dreams may or may not be significant based on Flanagan’s theory and the treat simulation theory. I will also discuss the reasons why or why not dreams may have an evolutionary function.

Read More
306 Words | 2 Pages

Unilineal Evolution is the theory that societies evolve in a linear progression. At the beginning of the line of progression you have the least progressed societies or “savage” societies. At the mid-point of this line there are the “barbarian” societies and at the end of it is the “civilized” societies. There really are no strengths in Unilineal Evolution. All the information is based on the bias that undeveloped societies are less intelligent which is overall a racist Diffusionism is the theory that societal change happens when societies borrow cultural traits.

Read More
336 Words | 2 Pages

ccording to lecture, the four mechanisms of evolutionary forces are mutation, natural selection, genetic drift, and gene flow. Mutation is defined by a change in the genetic code. This happens spontaneously. There are three major types of mutation. Point mutation is when there is a change in base substitution and may or may not produce a new amino acid.

Read More
917 Words | 4 Pages

1. There are 2 types of worms: worms that eat at night (nocturnal) and worms that eat during the day (diurnal). The birds eat during the day and seem to be eating ONLY the diurnal worms. The nocturnal worms are in their burrows during this time. Each spring when the worms reproduce, they have about 500 babies but only 100 of these 500 ever become old enough to reproduce.

Read More
973 Words | 4 Pages

Poaching and illegal hunting can cause an off set in the ecosystem by overhunting animals. When one animal population decline drastically, other organisms are affected too. The decline in native predators is the main cause for overpopulation of animals like deer. Deer overpopulation has led to rapid decrease vegetation life causing other animals to be put at risk. Removing predators from the food web disrupts the entire balance of an

Read More
517 Words | 3 Pages

Mutation will not generate a new species in microevolution. Mutation is a change in nucleotide sequence of the genome of an organism, or chromosomal DNA or other genetic elements. Mutation occur when old alleles is changed into new alleles. This could occurred at two levels either in genetic levels or chromosomal levels. Since all cells in our body contain genetic materials, there are lots of places for mutations to occur.

Read More
1441 Words | 6 Pages

Background Jakarta has a population of about 9.6 million people and in the last three decades, urban development of Jakarta has grown very rapidly in many sectors starting from industry, trade, and transportation until real estate. The increase in Jakarta’s population and urban development had cause several environmental problems including land subsidence. Land subsidence is a gradual settling or sudden sinking of the Earth 's surface owing to subsurface movement of earth materials. The level of soil in Jakarta is slowly degrading due to the disturbance of the soil consistency, and the water level in the soil is slowly decreasing, and now the sea level in Jakarta is higher than the ground level. In another word, Jakarta has been experiencing

Read More
1251 Words | 6 Pages

This occurs when limiting factors slows down the growth rate. It predicts that when a population size is small or large, the growth rate will be small and that the population growth will be at its highest when it is at an intermediate level relative to the carrying capacity. Lastly, the regulation of Population Growth; which has to do with the limiting of population growth of a long term by a mixture of density-independent and density-dependent factors. Factors of density-dependent intensify as the population density increases. On the other hand, regardless the population size, density-independent factors affect the same percentage of

Read More
978 Words | 4 Pages

Traffic congestion is a condition on convey networks that occurs as use increases, and is characterized by more gradual speeds, longer trip times, and incremented vehicular queueing. The most mundane example is the physical utilization of roads by conveyances. When traffic demand is great enough that the interaction between conveyances slows the haste of the traffic stream, this results in some congestion. As demand approaches the capacity of a road (or of the intersections along the road), extreme traffic congestion sets in. When conveyances are plenarily ceased for periods of time, this is colloquially kenned as a traffic jam or traffic snarl-up.

Read More

More about Bottleneck And Founder Effects Of Genetic Drift

Related Topics

Open Document