StudentShare solutions
Triangle menu

Features of population genetics - Essay Example

Nobody downloaded yet

Extract of sample
Features of population genetics

Consequently, the species is more likely to become extinct if environmental conditions change, even minimally. One such virus that can induce genetic changes is the West Nile virus (WNv), and it has the capacity to change the genetic sequencing of animal species, predominantly birds. WNv can be passed to humans and other mammals via mosquitoes and causes mild to severe illness, and in some cases death.
The investigators presented data that supported a phylogenetic conclusion that the MNv epidemic of North America already reached an epidemiological plateau. The conclusion that peak prevalence has been passed was based on the decline in the population growth of WNv in recent months.
Snapinn et al.'s method of trying to quantify the emergence of MNv in the USA contrasts with that of previous research, such as Hull et al. (2006) and Naugle et al. (2004) who observed antibody rates of birds to identify the prevalence of WNv infection. The results for Hull's study showed that antibodies to WNv were found across all raptor groups across two geographical regions. This supports the conclusion that many of the wild raptors had survived a WNv infection. In contrast, Naugle and colleagues observed that their sage-grouse sample did not exhibit WNv antibodies, suggesting that the species lacks resistance to infection. For both studies it appears that the summer months are times of increased infections, perhaps due to the increase in mosquito populations. These conclusions were drawn from evidence of statically different antibody rates across summer and winter regions used in each sample.
Statistical methods were used to track the WNv population, estimating a set of parameters; rate of evolutionary change; sequences divergence time; and rate of viral population growth. These factors were based on the changes observed in gene sequence data. This method of modeling estimates the level of new infections across all species that can be host to WNv. This is a reasonable conclusion given that a virus leaves an epidemiological 'history' on gene sequences.
The limitation of this study was that the statistical estimates used a viral sample from only one species - birds (corvids and raptors), and from only one geographical region - northeastern USA. It may be that species differences affect the lifespan of the virus, and that such a narrow geographical sample does not reflect random sampling of the entire population (which exists across the entire nation), and so is not representative. There may be confounding variables such as climate, pesticides, food availability or predators that impact on the health of the birds in this region that make them more resistant to MNv. Such a case would be of interest in developing a vaccine to the virus, but does not illuminate the true state of affairs with regard to the population growth, stagnation or decrease of MNv.
Hull's study drew plasma specimens from Red-tailed Hawks (Buteo jamaicensis), Red-shouldered Hawks (B. lineatus), and Cooper's Hawks (Accipiter cooperii) was
Whilst Naugle and colleagues collected the serum of 112 radio-marked sage grouse (Centrocercus ...Show more


Population genetics describes how the frequencies of the alleles which control a trait change over time. Populations allow a study of the frequency of changes, and gene frequencies enlighten science as to the processes of evolution. A key issue for the dynamic evolutionary change of any organism is the measurement of variability…
Author : ehudson
Features of population genetics essay example
Read Text Preview
Save Your Time for More Important Things
Let us write or edit the essay on your topic
"Features of population genetics"
with a personal 20% discount.
Grab the best paper

Check these samples - they also fit your topic

Population genetics
This further led him to formulate DNA typing or the process of isolating that region of the DNA strand and identifying it. [1] Since then, the use of DNA as evidence has become widespread. News about convicts who had spent years in prison, but were suddenly released because they were proven innocent of the crimes they were convicted of on the strength of new DNA evidence has made this new technology a source of wonder and hope for many who may have languished in jails for crimes they did not commit or those who were victim of unsolved crimes.
12 pages (3000 words) Essay
Population genetics
Heterozygotes will be (pxq) + (qxp) = 2pq and the chance of homozygotes aa will be q2. The three genotypes will be in the frequencies p2:2pq:q2. The allelic frequency of p will not change and is still p and this equilibrium will go on forever. The Hardy-Weinberg equilibrium means that sexual reproduction does not cause a constant reduction in genetic variation in each generation; on the contrary, the amount of variation remains constant: generation after generation in the absence of a disturbing factor.
2 pages (500 words) Essay
Fungal genetics assignment
Fungi are a diverse group of organisms in characteristics; based on these features some fungi are benefical to man, som eare very dangerous to man and some are benefical to the unverse at a broader context. The beneficial effect of these organisms is that they are responsible for th fermentation process resulting inbread, beer an yougurt such as, yeast.
10 pages (2500 words) Essay
In order for such a procedure to be done, two RAD51 targeting constructs that contained either neomycin or blasticidin first had to be prepared. Once these targeting constructs were prepared, the RAD51 neo constructs were transpected into DT40 cells, and heterozygous clones were isolated for the RAD51 gene.
3 pages (750 words) Essay
ant trait) and the other that is a short plant (recessive trait) is expected to produce an F1 (first) generation of plants that are al tall because the allele of tallness would dominant to shortness in the offspring produced. However, all plants produced in F1 generation would
4 pages (1000 words) Essay
The human cells consist of 46 chromosomes. Of these, two are sex chromosomes and 22 pairs are autosomal chromosomes. The sex of a human being is
8 pages (2000 words) Essay
Here a gene could be cut into small fragments, and a fragment from another gene having a different make up, can be inserted between the cut fragments, and then reattached together to form a completely new gene. There are many
12 pages (3000 words) Essay
Population genetics
This further led him to formulate DNA typing or the process of isolating that region of the DNA strand and identifying it. [1] Since then, the use of DNA as evidence has become widespread.
12 pages (3000 words) Essay
Each gene codes for a specific protein in the body by specifying the order that the amino acids needs to be joined together. The function of the DNA in the body is carrying genetic code of information that determines the characteristics of a living thing but it is
10 pages (2500 words) Essay
If you fertilize a trisomic Jimson weed plant, what zygotes would be formed? Tell which zygotes are diploid and which are trisomic. Assume that only the univalent mode occurs during meiosis; 2. Down syndrome can result from a Robertsonian
3 pages (750 words) Essay
Hire a pro to write
a paper under your requirements!
Win a special DISCOUNT!
Put in your e-mail and click the button with your lucky finger
Your email
Comments (0)
Click to create a comment
Contact Us