Essay On Cri Du Chat Syndrome

Meiosis is the process sex cells undergo for division. Unlike mitosis where cells reproduce from a diploid number of chromosomes to a diploid number of chromosomes, meiosis produces diploid cells from haploid cells. Diploid and haploid are names for the number of chromosomes a cell has, soma cells or body cells that reproduce through mitosis are diploid, meaning they have 46 chromosomes (in humans), haploid cell have half as many chromosomes as diploid cells; 23 in humans. Sex cells or gametes are haploid, to undergo sexual reproduction.
Meiosis is a process similar to mitosis in some ways, however the phases of meiosis cycle twice. The first cycle of meiosis consists of; prophase I, metaphase I, anaphase I, and telophase I. In prophase I, the
Cri-du-chat syndrome was named because of the distinct cry effected babies have. Cri-du-chat syndrome was discovered by the same scientist that discovered Down syndrome, Jerome Lejeune in 1963. Of genetic disorders caused by chromosomal deletion, cri-du-chat syndrome is the most common. This disorder is cause by a region of chromosome five being broke, or deleted, which causes all of the genes located on that region of the chromosome to be deleted. The actual error of this disorder probably occurs in the synthesis period of interphase because this is when DNA replicates itself, where the error for the deletion would occur. The deletion can occur at any step in meiosis, once chromosomes are visible in prophase. The phenotypic characteristics of individuals effected by this disorder are numerous. Most individuals affected will have smaller than average heads, and unusual facial features like, widely set eyes, small chins, and round faces. Individuals can also have incorrectly developed “voice boxes”, which causes the cat cry the disorder is named after, they can also have any number of muscle, heart, and or skeletal