Chromosome 15

Trisomy X Trisomy x syndrome, also known as triple x and 47xxx, is characterized by the presence of an extra x chromosome in each cell of a female. Three x chromosomes are present, rather than a normal pair in the nuclei of body cells. The first published report of a women with triple x syndrome was Patricia A. Jacobs at Western General Hospital in Edinburg, Scotland, in 1959. The condition occurs in about 1 in 1,000 newborn girls. Five to 10 girls with triple x syndrome are born in the united…

from a extra copy a chromosome, in most cases it is an extra part of chromosome 21. A chromosome is found in most living organisms which is responsible for carrying genetic information. An average Zygote (a fertilised Ovum) will have 23 pairs of chromosomes but in the case of a genetic disorder such as down syndrome, a problem will occur with the chromosomes and can cause physical…

Have you ever wondered about Down Syndrome and what exactly causes it, or even the health problems that these children and adults face? Down Syndrome, often known as DS, is a genetic condition which is caused by an extra chromosome. Down Syndrome is also the most common genetic disorder. There is no way of preventing Down Syndrome, although genetic counseling is available to figure the odds of having a baby with Downs. Over the course of many years, more tests and screenings have become…

For instance, there are two types of chromosomes: autosomal and sex chromosomes. Sex-linkage behaves differently from autosomal chromosomes since males tend to have more impacts. In addition, crossing over can also happens between homologous chromosome; however, the frequency of having recombinant of two genes varies depending the gene loci. Crossing over can happens to any chromosome except for the male fruit fly sex chromosome due to unknown reason. Recombinant frequency uses to…

meiosis has a synapsis of homologous chromosomes while mitosis does not. During daughter cell number and genetic composition, mitosis has two, each diploid cell is identical to the mother cell. While during meiosis this changes to 4 and each haploid cell contains half as many chromosomes as the mother cell and is inherently genetically different than the mother cell. Another difference is how the chromosomes align at the metaphase plate, during mitosis the chromosomes will align at the center,…

disadvantage of using the FISH technique is that only 10 to 12 chromosomes can be analyzed at a time, while a human cell contains 46 chromosomes. This lessens the chances of transferring a healthy embryo to the mother’s womb, because some mutated chromosomes might not have been discovered (“PGD/PDS”). However, this technique would be useful for Huntington’s disease because the CAG repeats that cause the disease are only located on chromosome 4 (HD). Along with preventing inherited diseases…

partial loss of an X sex chromosome[2]. Symptoms of Turner’s syndrome include, but aren’t limited to short stature, glucose intolerance, broad chest and widely spread nipples, amenorrhea, webbed neck, aortic valve stenosis, visual impairments, hearing loss, problems with concentration, and nonverbal learning issues[3]. Not all individuals will present with the same combination of symptoms or with the same expressivity[4]. About half of the 2,500 births have only one X chromosome. This is called…

Section 1 The genetic disorder Cri Du Chat stems from the deletion of a portion the p arm of chromosome 5 in the affected person. This deletion is seemingly spontaneous in most affected individuals. “Approximately 90% of cases results from a sporadic, or randomly-occurring, de novo deletion” (6. pg. 606). This deletion may include a fraction to the entire loss of the p arm of the fifth chromosome as a whole. Taking into consideration the very spontaneous nature of this disorder, at…

have an additional chromosome while some don’t this is known as mosaicism. The Mosaic trisomy 21 takes place when the error in the cell division happens early in development though it is after the sperm and the normal egg unite. This can also take place in early development when there are some cells who lose an extra chromosome 21 which was present at conception. Symptoms for this form vary between the Trisomy 21 but this depends on the amount of cells which have an extra chromosome.…

Turner’s syndrome is a condition that results in a person only being born with one X chromosome. This condition is due to when someone is born with only one sex chromosome. Those who have Turner’s syndrome have one X-chromosome and are missing the other sex chromosome. Because there is the presence of an X chromosome only those with Turner’s syndrome are consider having the sex of female. This syndrome results in a vast variety of medical issues, but most issues that those who have this syndrome…