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Nondisjunction In Meiosis

Referencing Styles : MLA | Pages : 1

The human body cells comprise of two different sets of 23 chromosome that make up a total of 46 chromosome, except sperms and eggs cells. The two different chromosome sets is termed as diploid and labelled as 2n. The sperm and eggs cells are known as gametes, and they comprise of only single set of 23 chromosomes that is termed as a haploid, or n. During the mate of two haploid gametes (consisting of one sperm and one egg cell) mix during reproduction, result in production of diploid cell. Occasionally during anaphase (stages of cell division), the chromosome will be unable or fail to divide suitably that is termed as the condition of nondisjunction. The condition of nondisjunction can take place either through meiosis I or meiosis II that is known as nondisjunction of meiosis.

Meiosis is defined as the procedure of producing haploid gametes from the diploid cells. If the whole thing goes smoothly throughout meiosis, the chromosomes will get divided and dispersed consistently to yield four different haploid gametes. Though, occasionally chromosomes does not divide properly as the standard dividing procedure that leads to alternations known as nondisjunction and leads to gametes formation associated with either very less or limited chromosome or very excess number of chromosomes. In case of humans, the condition of nondisjunction is considered as very common condition affecting primarily the older population.

The diploid cell consists of one set of chromosomes that is produced from the eggs and another set of chromosomes that is produced from the cells of sperm cell. This produced diploid cells will further distribute and mature into the form of baby. Any disappointment of combined chromosomes to disperse (to disjoin) through cell division, which will result in single daughter cell, where the genetic material is not transferred to the other cell. Nondisjunction leads to errors or inaccuracies in chromosome quantity, like trisomy 21 (also termed as Down syndrome) and monosomy X (also termed as Turner syndrome). Nondisjunction in meiosis also leads to early unprompted abortions.

If the condition of nondisjunction takes place during anaphase I of meiosis I, it will explain or mean that minimum or at least of one duo of homologous chromosomes that failed to separate. The conclusion will explain that two cells will receive an extra or additional duplicate of single chromosome associated with two cells, which have omitted that chromosome. In case of humans, n + 1 entitles a cell that comprise of 23 chromosomes with an additional copy of single gene that make up a complete of 24 chromosomes. n - 1 entitles a cell misplaced a chromosome for producing a whole of 22 chromosomes within humans. If the condition of nondisjunction happens during anaphase II of meiosis II, it will state that at minimum of one couple of sister chromatids failed or did not divide. Therefore in this situation, two different cells bear the usual haploid amount of chromosomes. Moreover, single cell will consume an additional chromosome (n + 1) and single will not consist of any chromosome (n - 1).

Down’s syndrome is considered as the genetic disorder and is included under the most communal autosomal chromosome abnormalities in humans that result due to additional genetic material. The additional genetic material is transferred from chromosome 21 to the newly produced embryo. The transfer of additional DNA and genes leads to alteration of the foetus and development or growth of the embryo, which further result into mental and physical abnormality.  Down’s syndrome is primarily caused due to nondisjunction in meiosis as the normal human body consist of 23 set of chromosome (termed as autosomes) and two sex chromosomes (termed as allosomes). During conception, formation of new cells takes place, which receives an individual duplicate of each individual chromosome formed due to mating of egg and sperm. The novel cell distributes and increases to produce an embryo that will ultimately lead to the development into foetus and later as a new human. Each and every cell comprises the precise similar genetic content as the normal 46 chromosomes, comprising the similar DNA and genes.

The patient’s suffering from Down syndrome, develop an error that happens during the mating of chromosome 21. The additional genetic components is accountable for developing the abnormalities that result in nondisjunction in meiosis (Down’s syndrome). In this condition, total 47 chromosome are produced instead of 46 chromosomes associate with additional two sex chromosomes. The supreme common inaccuracy in chromosome duplication is called as trisomy 21, which occurs new cell grows three duplicates of chromosome 21, instead of producing two copies of duplicates. The condition of trisomy 21 affects more than 95% of the people around the world.

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