CHROMOSOMES AND DNA

EXPLANATION: Chromosome are thread like structure that appears inside the nucleus at the time of cell division.They were first observed by German embryologist Walther Fleming in 1882,when he was examining the rapidly division cell of Salamander Larvae.Since there discovery chromosomes have been found in cell of all eukaryotes.There number varies however from species to species.Penicilium,a fungus,has only one pair of chromosomes while...

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COLONING

Coloning is a technology for achieving augenic aims. DEFINITION: CLONE: A clone is defined as a cell or individual and all its sexuality produce offspring. INFORMATION: All members of clone are genetically identical except when a mutation occur. GENERAL: Generally no normal animal reproduce naturally by coloning.Several insects and many plant do, in some circumstances whereas few do so regularly. HISTORY:  In 1997 scientist Scotland succeed in coloning of sheep.Other mammalian species( mice and cows) have since been...

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DIGESTION IN INSECTIVOROUS PLANT

There are few plants that supplement their organic diet with organic compounds. These organic compounds are obtained by trapping and digesting insects and and small animals.All of the insectivorous plant are true autotrophs.but when they capture the prey,their growth become rapid.Apparently nitrogeneous compounds of animal body are of benefits to these plants.In some plants trapped insects are composed by bacteria.In others trapped insects...

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DOUBLE HELICAL STRUCTURE OF DNA(WASTON AND CRICK'S MODEL)

Learning informally of franklin's result,before they were published in 1953, James waston and Francis Crick, two researchers in the university of Cambridg,quickly worked out likely structure of the DNA molecule which we now know was substantially correct.They They proposed that molecule is a single double helix,with the basis of two starnds pointed inward toward each other, theu forming base pairs.In their model base pairs always consist...

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FEMALE REPRODUCTIVE SYSTEM

The female reproductive system consist of an ovaries, the oviduc,uterus and the external genitalia.A pair of ovaries lies within the body cavity of the female.Germ cells in ovary produce many oogonia which decided mitotically to form primary oocytes.These are in closed in the groups of follicle cells.The primary oocytes divides mitotically into haploid secondary oocytes and first polar body.second meiotic division in the oocytes proceed...

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MALE REPRODUCTIVE SYSTEM

Man reproductive system  (Male reproductive system): consist of genitalia which consist the pair of testes which lie outside the body,in the sac like scrotum and male copulatory organ which is used to transfer sperms into the female reproductive tract.Each testes consist of highly complex system called seminiferous tubules,in which repeated division by the cell of germinal epithileum produce spermatogonia.These increase in size...

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