Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Chromosomes and Their Organization
During division phase , the duplicated chromatin fibres become extremely shortened (= condensed), by coiling and folding ,into short think and microscopically visible rod like structures of various shapes and sizes, It is necessary to learn about these structures before dealing with the sequential changes of mitosis. These structures werer observed first by Naegeli 1842 and later by russow 1872 and Balbiani 1876 waldeyer 1888 named these, chromosomes gr.khroma =coloured + soma =body ) because these take a dark stain when treated with basis dyes.
Karyotype :Beneden 1888 discovered that the chromosomal pattern is a specific character .i.e. each species has its own chromosomal complement different from those of all other species ,This complement of a species is called its karyotype .It implies that in all cells membrane of a plant or animals species, not only the number of chromosomal is the same but even the shapes sizes, and structure of the various chromosomes in the set are the same .The chromosomal number varies from 10 to 50 in most of the species, The smallest number is however two found in a nematode subspecies ascaris megalocephala univalence, and the largest number is 1600 in aulacantha ( a radiolarian protozoan ) To quote a few examples the chromosomal number is 46 in man ( Homo sapiens ) 32 in Hydra vulgaris. 12 in housefly (Musca domestica ) 26 in frog (Rana pipiens ) in rabbit, (Oryctolagus cuniculus ) 38 in cat (Felish domesticus ) 78 in dog (cains familiaris) 80 in pigeon (Columba livia) 8 in fruitfly ( Drosophila melanogaster ) in mosquito ( Culex pipiens ) and so on.
Effects of Noise - Noise Pollution Noise can affect in the following three ways: Interferes with communication, Diminishes hearing and Affects health and even
Rabies Rabies, a fatal zoonotic viral disease of dogs, cats, man and other mammals, causes an acute encephalomyelitis. The rabies virus belongs to the genus Lyssavirus in the
What is the mode of nutrition in fish,human,amoeba,scorpian & toad ?
Explain the Mechanism of Drying? Drying as a mechanism, you will realize, involves the removal of free moisture from the surface and also moisture from the interior of the mate
What category do pisces, mammalla, amphibia, reptilia and aves fall into
Situation in which a closed loop negative feedback system is converted to an open loop system? A. A disease that destroys all the adenylyl cyclase and all the cAMP in the
Leaving the deserts as you approach the tropical regions of the earth you will enter the savanna biome, which is a combination of grassland with scattered or clumped trees. These s
Explain Electron Volt Electron Volt: Amount of kinetic energy obtained by an electron, initially at rest, after undergoing an acceleration by a one volt potential difference.
Define Procedure for estimation of vitamin c - colorimetric method? Carry out the experiment following the instructions given herewith: 1. Prepare a series of tubes for blan
Q. Explain Restrictive cardiomyopathy? It is a systemic or idiopathic disorder of the myocardium with clinical and hemodynamic features of diastolic dysfunction, closely simula
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd