Essays Tagged: "sex chromosomes"

The Fragile X syndrome and Duchenne muscular dystrophy (DMD) disease comparation

. Human cells have 46 chromosomes (fig 2 below) - 22 pairs of autosomes chromosomes 1 to 22 and two sex chromosomes X and y or X and X depending gender (sex-linked). Within these chromosomes are rough ... enes that controls and construct the organs in the body.There are over approximately 250 recognized sex-linked diseases, affecting every organ system. Of these, 95% affect males as it reflects the pre ...

(14 pages) 88 3 2.4 Nov/2003

Subjects: Science Essays > Biology

Determining a childs sex

Determining Sex:What determines a child's sex? Usually it is the sex chromosomes in which two X chromosomes in t ... from the embryo's yolk sac to the genital ridge. These germ cells are integrated into the primitive sex chord, which are fingerlike projections that have formed over the previous week.Male development ... e, the embryo will develop into a female via mechanisms that are not fully understood.The primitive sex cords, now called testes cords, have grown extending into the surrounding tissue. The cords now ...

(2 pages) 28 0 3.0 Mar/2004

Subjects: Science Essays

Chromosome 18 Research Paper

CTION:Chromosomes are fundamental to all life. There are 22 numbered pairs of chromosomes, plus two sex chromosomes. The sex chromosomes in females are the two X chromosomes and in male they are an X ... 0.74 ± 0.11, at the Australian Genome Research Facility (AGRF) (Ewen ). The mean ± SD sex-averaged distance between adjacent markers is 8.6 ± 6.5 cM (range 0 34 cM). The genomewid ...

(9 pages) 68 0 3.0 Mar/2004

Subjects: Science Essays > Chemistry

Alligators and Crocodiles: Comparison and Contrast

the bottom of the mouth, preventing the tongue from moving. One striking similarity is the lack of sex chromosomes; the youngs' sex is determined by the temperature at which the eggs are incubated; m ...

(1 pages) 96 2 4.3 May/2004

Subjects: Science Essays > Biology

Study Notes on Cytogenetics

of a person that's photographed at metaphase and arranged in orderautosomes- chromosomes 1-22; not sex chromosomessex chromosomes- chromosomes that determine the sex; X and Y chromosomestranslocation ... , making a triploid zygotetriploidy- condition in which there are three copies of all autosomes and sex chromosomestetraploidy- condition in which there are four copies of all autosomes and sex chromo ...

(3 pages) 48 0 4.7 Nov/2004

Subjects: Science Essays > Biology


s, one pair is different, one chromosome is shorter than its partner. These two chromosomes are the sex chromosomes.In females both the sex chromosomes are the same length.We use an X to represent the ... e two Xs or the X and Y are separated from each other during meiosis - the cell divisions that form sex cells or gametes. All healthy eggs produced by a human ovary have an X chromosome. However, with ...

(15 pages) 79 0 3.7 May/2005

Subjects: Science Essays

List of Genetic Disorders

s a condition caused by a chromosome nondisjunction in males; affected individuals have a pair of X sex chromosomes instead of just one. It causes the male to be infertile.Patau syndrome, also known a ... of small children.Turner syndrome is a human genetic abnormality, caused by a nondisjunction in the sex chromosomes that occurs in females. Instead of the normal XX sex chromosomes, only one X chromos ...

(2 pages) 34 0 3.0 Feb/2006

Subjects: Science Essays > Genetics & Genome Projects

Testing the transfer of alleles in Drosophila

oss which a punnet square can be used to identify the genotype of the cross. The second method is a sex linked cross which identifies the phenotypic expression of an allele that is related to the gend ... notypic expression of an allele that is related to the gender of the individual and is found on the sex chromosomes. This mode of inheritance is in contrast to the inheritance of traits on autosomal c ...

(7 pages) 29 0 1.0 Oct/2007

Subjects: Science Essays > Biology

Genetic Disorders

ne disorders known as X-linked disorders involves genes located on the X chromosome, one of the two sex chromosomes. An example of an X-linked disorder is hemophilia. People with hemophilia usually la ...

(3 pages) 25 0 0.0 Feb/2008

Subjects: Science Essays > Biology