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.
Examination is begun by placing the transducer in left parasternal region, usually in the third or fourth left intercostal space. From this position, a sector image of the heart
Q What are the differences and similarities between the transcription process and the replication processes? A DNA polynucleotide chain serves up as a template in the replication (
Explain about the Chemical Carcinogens? Chemicals have been shown to be carcinogenic. Some are naturally occurring components of plants and microbial organisms. Some are synthe
Define the symptoms in Bone marrow of pernicious anaemia? The nucleated red cells of the marrow are greatly increased. The successive nucleated cell stages in erythropoiesis a
What is Iodoacetate inhibitor Iodoacetate is the inhibitor of glyceraldehyde-3-phosphate dehydrogenase.
Tetanus This is an infectious, non-febrile disease of animals and man, and is characterised by spasmodic tetany and hyperaesthesia. The causative agent is Clostridium tetani,
N a ture of viruses Viruses vary in their size ranging from 20 nm (200 Ao) to 350 nm (3,500 Ao) and in shapes from spherical to bullet, rod, brick or filamentous forms. Some
Observing the development of flowers into fruit Collect specimens of flowers in dissimilar stages of maturity from newly opened buds to specimens in which the petals have falle
What term is used to describe the range of organisms in a habitat
Q. What do you mean by Hemichordata ? Hemichordates re vermiform (worm-like) animals which have few characters like those of the chordates, hence the name hemichordata (hemi :
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