Genetics and Evolution - Essay Example

Only on StudentShare

Extract of sample
Genetics and Evolution

Thus in such situations the characters used to recognise the species becomes merely diagnostic, not distinctive. Biologically speaking, these are a connected series of the species in neighbouring areas which interbreed with two end populations which are too phenotypically and geographically separated that they cannot interbreed. These two genetically and phenotypically diverse populations which represent the end populations may exist in the same geographic region, yet due to genetic and phenotypic diversity would not interbreed. As an example, the case of Larus gulls can be taken, the different species of which form a ring around the North Pole. The Lesser Black-beaked Gulls in Siberia form a part of this ring, and although they descend from the same species, adjacent Herring gulls are so different from them that they do not interbreed.
Earnst Mayr's Biological species concept tends to recognise species based on defined phenotypic characters. Mayr defined species as groups of interbreeding populations, which do not reproduce across other species. This builds in a concept of reproductive isolation from other such groups. Particular species specific phenotypic characters or attributes prevent interbreeding with other species. ...Show more


Ring species is defined by a phenomenon of evolution where two species are apparently present at one place, but these two species are connected by a series of forms, existing in places connected geographically like a ring. The most important feature of ring species is that despite arbitrary similarities, no phenotypic characteristics can be used to divide this ring into two species…
Author : runolfssonjuwan
Save Your Time for More Important Things
Let us write or edit the essay on your topic
"Genetics and Evolution"
with a personal 20% discount.
Grab the best paper

Related Essays

Science and Scientific Change
Today, it is important that we engage ourselves in such debates, because a lot of people claim that truth is discovered not through theology, philosophy, or art, but rather, through science.
10 pages (2500 words) Essay
Processes of Evolution
(The University of California Museum of Paleontology, Berkeley, and the Regents of the University of California, 2008) Evolution is the reason why there is a great difference in the appearance and characteristics of plants, animals, human beings and other living organisms as time goes by.
4 pages (1000 words) Essay
Environmental Sustainability Master Essay
India, an Asian country, ranks 101 out of the 146 countries on the 2005 Environmental Sustainability Index (ESI), while Ireland is on the 21st rank. (Esty) ESI ranks countries according to their ability to protect the environment based on measures as health, governance, technology, and international cooperation.
8 pages (2000 words) Essay
Genetics Essay
However, all plants produced in F1 generation would be heterozygous for their trait unlike their parents that were homozygous for their respective trait. If the F1 generation is further paired among itself by a yet another monohybrid cross than an F2 generation of plants will be produced.
4 pages (1000 words) Essay
Evolution of colouration in bird eggs
Contingent on this idea is a further one of divergence of species' characteristics, which grants them slight but distinct variations that led Darwin to call each form an "incipient species." These differences may occur for more than one reason, and are evident in more than one stage of any creature's lifecycle.
11 pages (2750 words) Essay
Human Genetics
One would assume that Bob's father would be DD, with no gene for the disease. However, if his mother was Dd, and his father was DD, there is no probable chance or explanation for how Bob contracted the disease. The only possibility is that somehow Bob's father has the recessive trait and that got passed with the recessive trait from his mother to make Bob dd.
6 pages (1500 words) Essay
This gives the phenotypic ration of 9:3:3:1, white disc, white sphere, yellow disc, yellow sphere. The genotypic ratio is 1:2:2:1:4:2:1:2:1. All combinations are represented and would therefore occur. After pollination a plant with rough stems and yellow flowers with pollen from another plant of the same species having rough stems and white flowers, adequate precautions being taken to prevent pollination occurring in any other way, 80 seeds were obtained.
4 pages (1000 words) Essay
Major Histocompatibility Complex
Thus the Major Histocompatibility Complex or MHC is responsible for selective pressure that adaptively maintains genetic diversity in natural populations. Some other influences of the MHC include mating preference, vulnerability to diseases, cooperation, kin recognition, individual odours and immune recognition.
16 pages (4000 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
Find out how much would it cost
to get a custom paper written by a pro under your requirements!
Win a special DISCOUNT!
Put in your e-mail and click the button with your lucky finger
Your email