What is cytogenetics, Biology

Assignment Help:

What is Cytogenetics?

Before the advent of modern technology, the American biologists Thomas Hunt Morgan, G.W. Beadle, H. Sturtevant, Barbara McClintock, and others contributed greatly to our knowledge of genetics. They studied the microscopic appearance of chromosomes with respect to phenotypic traits, a discipline called cytogenetics.

Morgan chose to study the fruit fly, Drosophila, for several reasons: it has a short life cycle, it produces hundreds of offspring from a single mating, it can easily be raised in the laboratory, and it has only four pairs of chromosomes. The fruit fly is also well suited for cytogenetic studies because the salivary glands contain polytene chromosomes, in which the DNA has replicated many times without cytokinesis; as a result, the genes form condensed bands of different thicknesses called chromomeres that are visible at low magnification. The patterns of the bands, their thickness, spacing, and sharpness, can be used to determine if changes in chromosome structure has occurred.

 


Related Discussions:- What is cytogenetics

What are the classification of reasons of implant failure, Classification o...

Classification of the reasons of implant failure: In order to understand failures it is vital to know, why they occur. The reasons are plenty and to streamline, these have been

Animal physiology, what are the animals with respiratory organs?

what are the animals with respiratory organs?

Explain arthritis, Explain Arthritis Arthritis - Oral therapy with doxy...

Explain Arthritis Arthritis - Oral therapy with doxycycline or amoxicillin for 28 days is usually effective for treatment of Lyme arthritis. Patients who have not responded to

Explain resistance to infection in nutritional care, Explain Resistance to ...

Explain Resistance to Infection in Nutritional Care? Amino acids help to build the body's defence mechanisms like antibodies, blood cells, hormones and enzymes so as to prevent

What is coarctation of aorta, What is Coarctation of Aorta ? More commo...

What is Coarctation of Aorta ? More common in males (3:l). Narrowing of aorta typically located near aortic attachment of ligamenturn arteriosum or PDA. It can be a localized

How many distinct hexapeptides made from 20 amino acids, How many distinct ...

How many distinct hexapeptides can be made from 20 amino acids?

Blood transfusion , Blood transfusion  The blood of Raja cannot be t...

Blood transfusion  The blood of Raja cannot be transfused to Rama because the blood group of Raja is ‘B' and blood group of Rama is ‘A'. If Raja's blood with group ‘B' is

Theileriosis, T h e i l e r io s i s It is also referred as t...

T h e i l e r io s i s It is also referred as tropical theileriosis and results in fever, enlargement of superficial lymphnodes, anaemia and jaundice. E tiolo

Evolution of human kind, The evolution of human kind can be regarded as the...

The evolution of human kind can be regarded as the climax of phylogenic history of organisms. In the previous units of this block as well as the previous block we have detailed for

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd