Homologous chromosome

Genetic Diseases And Disorders Research Paper Down syndrome is a disorder of a person's chromosomes that cause mild to severe physical and mental disabilities. People are affected from birth and until death. Noticeable physical problems include a small skull , a narrowed or flat nose bridge, poor muscle tone, and folds beneath the eyes. It occurs in about one in every 700 births. Nearly 1600 kids are born with down syndrome in the united states. Most people that have down syndrome have…

In just 9 months a single cell, no bigger than a speck, of dust transforms into the most sophisticated organism on the plane, a human fetus. It all begins with the moment of fertilization, but days after it can take the most unexpected turn. Any tiny change or mutation in a gene can cause genetic disorders once you are born. It’s possible to inherit a gene mutation from one or both parents or, a condition caused by a DNA abnormality. There are so many rare conditions that are still being…

and Multifactorial Disorders. Chromosomal Disorders are caused by too many chromosomes, not enough chromosomes, or the chromosome structures are abnormal. Polymelia is considered as a Chromosomal Disorder. Some other diseases that are considered as a Chromosomal Disorder are Down Syndrome and Turner Syndrome. Single Gene Disorders are caused by defects in individual genes. Gene defects cannot be detected by chromosome analysis. Thalassemia…

Writing Assignment 1: Description of Unknown Mutant Allele Phenotype Subtle differences were observed after comparing all body parts of mutant and a wild type D. Melanogaster. It was discovered that normal venation pattern was disrupted in mutant D. Melanogaster. The phenotype mutation (vein pattern) of D. Melanogaster was identified with a different degree of expressivity in mutant D. Melanogaster; this was achieved by differentiating the single line (longitudinal vein 5) on a wild-type wing…

Research into the genetics of deafness has shown that mutations in the CX26 gene, located on human chromosome 13q11, cause non-syndromic recessive deafness (9, 10). Expression of GJB2 has been documented in a variety of cells and tissues. In the cochlea, CX26-containing gap junctions are proposed to maintain K homeostasis by ferrying K away from the hair…

Environmental-Dependent Sex Determination in Reptilians When we think of sex determination in organisms, we most often think of mitosis and the process of randomly receiving X and Y chromosomes from parent cells. This type of sex determination is known as genotypic sex determination (GSD), and it’s the most commonly found method of sex determination. However, this isn’t the only type of sex determination available to organisms. Some reptilians, for example, use environmental-dependent sex…

Barbra McClintock was born June 16, 1902, in Hartford, Connecticut (Editors). The third of four children born to physician Thomas McClintock and wife Sarah, McClintock was christened Eleanor, though her parents soon began to call her Barbra believing the nickname better suited her pragmatic demeanor (“Barbra McClintock”). Barbra demonstrated an interest in science from a young age, perhaps influenced by her father’s profession (Editors). At the age of seventeen, she graduated from high school…

Progeria also known as Hutchinson-Gilford Progeria syndrome is an extremely rare genetic disease where a person is born with the characteristics of an aged body. The word Progeria comes from the greek words “pro” meaning premature and “geras” meaning old age. This genetic disease only occurs in an estimated 1 in 8 million individuals, and there are no hereditary factors or environmental factors which affect the cause of progeria. The average life of an individual with Progeria is usually between…

3 Chromosomes are thread-like structures which consist of DNA and other proteins. Chromosomes are present in every cell of the human body so that information can be carried for that cell to develop. The human body normally consists of 46 chromosomes which then can be paired into 23 pairs. 22 pairs of chromosomes are similar in both males and females which are commonly known as autosomes. However, the 22nd chromosomes (X and Y) are different as these are the sex chromosomes. The human cell can…

additional chromosome. Trisomy 13 is a chromosomal disorder that affects either all or a portion of the 13th chromosome. Each person is given a set of chromosomes, one from mom and the other from dad. During embryo development, the 13th chromosome takes on an additional set from either parent. This results in a set of three chromosomes. The severity of the abnormality associated with Trisomy 13 depends on the specific location and percentage of the duplicated cell in the 13th chromosome. …