Nobody downloaded yet

Evolution of lactase gene in homo sapiens - Term Paper Example

Comments (0) Cite this document
(Name) (Professor) (Course) 11 December 2013 Introduction Lactase persistence is a condition in which the enzyme that digests a form of sugar found in milk (Lactose) persists into adulthood. Lactose is converted into glucose and absorbed into the bloodstream…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER94.3% of users find it useful
Evolution of lactase gene in homo sapiens
Read TextPreview

Extract of sample
"Evolution of lactase gene in homo sapiens"

Download file to see previous pages Genetics and molecular studies of genes presently and in the past are pointing towards an evolutionary cause behind its persistence in adults. In order to prove that something is a product of evolution, one must demonstrate that a favourable trait mutated. Additionally, one must show that the trait was transmittable to offspring and the environment favoured that trait. This may necessitate genital analysis of pre-historical data as well as present ones. Furthermore, these patterns ought to be analysed in relation to the behavioural or cultural patterns of the subjects as it could affect the adoption of the trait. The paper will look into these dimensions in order to illustrate the evolution of the lactase gene. Advantages and disadvantages in a population Lactase-phlorizin hydrolase (LPH) is the enzyme responsible for the digestion of lactose in Homo sapiens. Lactase activity in the intestines depends on the maturity of the person under consideration. Infants between two to eleven months old have some of the highest activity levels. As a child reaches the age of five, lactase activity reduces, and this may continue in subsequent times. Therefore, the amount of the LPH enzyme will reduce because a person stops suckling or consuming lactose. Conversely, some adult populations continue to maintain high level of lactase activity, especially those with North European descent. This persistence of activity is an evolutionary development that coincides with the development of the dairy industry in most parts of the world (Grand et. al. 618). It is thus advantageous to ingest lactose in adulthood because this will not limit the person’s dietary intake. They will have the freedom to consume milk without dealing with health challenges. Prior to the domestication of animals, adult populations did not need the lactase enzyme. Therefore non persistence was the available state. However, this dramatically changed when animals started providing milk to the human population. It became genetically advantageous to retain the lactase enzyme in adulthood. Since only persons with this enzyme can enjoy the nutritional benefits of milk, then lactase persistence is beneficial. Culture dictated gene adaptability and advanced evolution (Hollox 267). Milk is nutritionally beneficial to the human body because it a rich source of calcium. Therefore, consumption of the beverage would protect one from bone-related diseases such as osteoporosis (Swallow 208). Rickets is an undesirable condition that also emanates from the lack of calcium. It is a selective force that favoured the ingestion of milk. The lack of the lactase enzyme in adults leads to a number of difficulties when dealing with the digestion of milk. Once such individuals consume milk, the lactose in milk will stay undigested. No alteration in blood glucose will be detected if a test is done. Instead, the product will enter the colon and be fermented. Fermentation causes the production of gases such as hydrogen and fatty acids. This is possible through the action of bacteria in the gut. Usually, persons who are lactose intolerant will suffer from bloating or gaseousness, diarrhoea, nausea, cramps and discomfort after taking milk. The gases that are produced after fermentation can be detected through portable hydrogen analysers (Itan et. al. 8). Therefore, it is highly desirable to be lactase persistent. All the complications that emanate from fermentation would be absent. Swallow (207) highlights some potential risks of having ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
(“Evolution of lactase gene in homo sapiens Term Paper”, n.d.)
Retrieved from https://studentshare.org/biology/1493611-evolution-of-lactase-gene-in-homo-sapiens
(Evolution of Lactase Gene in Homo Sapiens Term Paper)
“Evolution of Lactase Gene in Homo Sapiens Term Paper”, n.d. https://studentshare.org/biology/1493611-evolution-of-lactase-gene-in-homo-sapiens.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document
Evolution of Management Accounting
In Kaplan (390), the development of managerial accounting was rapid between 1850 and 1920 due to a rapid expansion of business, especially in the transport and textile industry. The pioneers of management accounting wanted to simplify the operations of the business and achieve a greater efficiency and profitability.
11 Pages(2750 words)Term Paper
Evolution of Formal Organizations Paper
Formal organizations are designed in such a way that each member or group has a specific obligation to fulfill, and whose overall purpose is to achieve the primary goals of the company or institution. This paper aims to highlight the evolution of formal organizations in the last century, the steps that informal establishments can take to attain a formal organization status and provide a forecast on the fate and direction of existing pseudo-formal organizations.
4 Pages(1000 words)Term Paper
In specific, different theories exist in the case of evolution; however, theistic evolution is one of the theories that have been able to influence people. It
5 Pages(1250 words)Term Paper
Review of the N314D Point Mutation on the GALT Gene and its Relationship to Galactosemia Type I
Galactose-1-phostpahte uridyl transferase converts the galactose- 1- phosphate into UDP-galactose. The deficiency of this enzyme leads to the accumulation of Galactose-1-phosphate inside the cells, and that accumulation of galactose-
17 Pages(4250 words)Term Paper
To this end, evolution is distinctively explained by several theories. Evidently, the pre Darwinian theorists such as James Usher advanced the creationism version of
3 Pages(750 words)Term Paper
Is Evolution True
The writer states that life on earth has evolved gradually and it began with only one primitive species as a self-replicating molecule that existed 3.5 billion years ago. The paper describes the evolution fact, how genetics have changed overtime, the whole idea of gradualism and the many generations in which evolution has undergone.
8 Pages(2000 words)Term Paper
This paper provides a critical reflection on every chapter of the book in an attempt to get deeper understanding of evolution. This is the introductory part of the book. In my view, the book covers key
10 Pages(2500 words)Term Paper
Why Evolution Is True
Coyne. The topic of evolution has been an argument from time immemorial. The mentioned book by Coyne covers this argument in a more detailed manner. He
10 Pages(2500 words)Term Paper
On the other hand, disruptive selection occurs when extreme traits are chosen over intermediate traits whereas stabilizing selection is when intermediate traits are selected over extreme traits. 8. Genetic drift and mutation can lead to
2 Pages(500 words)Term Paper
Why Evolution Is True

According to the paper, life on earth was; as a result, of the creation by a divine force. Most religions believe in a common concept of creation by a Supernatural Being. A commonly accepted account of this theory is found in the Bible, which is inscribed that God created the earth and all its content in five days.

12 Pages(3000 words)Term Paper
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Term Paper on topic Evolution of lactase gene in homo sapiens for FREE!
logo footer
Contact us:
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us