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!
MEIOSIS
Every organism is mortal, It becomes old and wornout with advancing age (= ageing ) and ultimately dies ,Before death however ,it reproduces its own kind, so that its race species continues, Many protozoan and some lower metazoans reproduce asexually by mitosis .Inheritance in these is obviously uniparental some protozoans and most metazoans perpetuate their species by sexual reproduction . Inheritance in these is therefore biparental, because reproduction involves union of two sex cells or gametes ( male gametic cell or sperm and femal gametic cells or ovum), producing a single cells called zygote, from the zygote , then arises the entire multicellular body of a new progeny by its repeated mitotic division and different iation of resultant cells into the different types.
If the gametes were diploid like all body (= somatic) ,cell the zygote would have twice the number of diploid chromosomes (tetraploid -4 x or 4n and the number would go on multiplying in that order generation after generation .No species can survive if its karyotype multiplies in this way, Hence to prevent this situation ,sex cells or gametes are made to possess a single set of chromosomes i.e. only half the number of chromosomes present in the karyotpye ,This single set is called haploid or monoploid (x or n) gametic set in contrast to the diploid ( 2x or 2n) karyotypic or somatic set of chromosomes .
The haploid sex cells are formed insexual organs i.e. gonads (testes in males and ovaries in females ) from diploid germinal cells by a specialized process called gametogenesis (spermatogenesis in males and oogenesis in females) This process necessarily involves a single duplication of chromosomes but two consecutive cell division. The second division is mitotic but the first one is a special type of reduction cell division called meiosis (Gr meioum =to diminish ) which bring about the aforesaid reduction in chromosomal number to half in the resultant gametes . Conventionally , the two division are designated as first and second meiosis.
Relapse of infective endocarditis usually occurs within two months of the discontinuation of antimicrobial therapy. The relapse rate for patients with native-valve endocarditis cau
Phytoplankton Stage - Hydrarch In this initial stage, the pond water is poor in nutrients and is devoid of much life. At this stage, the water is incapable of supporting large
Discuss the various types of techniques used in forensic biology past and present.
What are protein hydrolysates? Proteins that have been treated with enzymes to break them down into amino acids or shorter peptides are referred to as protein hydrolysates.
why we call leech as sangivorous
Define Endocrine or Hormonal Disorders - Infertility Infertility can be caused by endocrine disorders, long-term sequelae of sexually, transmitted infections, puerperal sepsis,
In some types of cells, the cell membrane present differentiations that are essential for the specific functions of the cells. The major differentiations are the microvilli and the
EPITHELIA L TISSUE OR EPITHELIA Epithelium term coined by Ruysh, it was applied originally to thin skin covering the nipple. (G.epi = upon, thele = nipple) Epithelial tis
Define Methods of Determination of Proteins and Amino Acid Content in Foods? The methods for protein quality evaluation are grouped under the following headings: I) Analytic
Explain what is Third Heart Sound S 3 ? S, is generated during the rapid filling pliase. It is a low frequency event. Mechanism of S, production: It is due to a sudden limita
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