The current orientation is nothing more than a historical accident. The first map with chromosome numbers was published by Hawthorne and Mortimer (Genetics (1960) 45: 1085-1110). There were earlier maps by Lindgren and others but they did not name the chromosomes. It is clear from the first map the chromosomes were oriented with the long arm to the right of the centromere and this orientation has not changed. Since that 1960 paper, chromosomes I through X have been in the same orientation.

See the online poster, Human Genome Landmarks: Selected Traits and Disorders Mapped to Chromosomes. This poster provides chromosome-by-chromosome maps of some of the genes, traits, and disorders that have been linked to each chromosome. These maps were generated using the Online Mendelian Inheritance in Man database. The Genome Database (GDB) and the Human Genome Map Viewer available through the National Center for Biotechnology (NCBI) are other resources that you can use to browse the genome.

The discovery of the chromosome was descriptive from the beginning and inseparably interwoven with the discoveries of the cell and the nucleus. All findings became possible only after Leeuwenhoek?s invention of the microscope in 1674. In 1831 Robert Brown described the 'areola' in orchids being constantly detectable in all cells. He called this areola'the nucleus of the cel'.1838 M. J.

ldquo;Full Aneuploidy Panel” tests for chromosomes 13, 15, 16, 18, 21, 22, X and Y because these are the chromosomes that are most commonly abnormal. A normal cell should show 2 FISH signals (or lights) for each of the numbered chromosomes, and either 2 X signals for a female or 1 X and 1 Y signal for a male. There are only five different colors that can be used, so most tests are done in two parts.

A. Leopards, like all cats, have 19 pairs of haploid chromosomes including the two "sex" chromosomes (X and Y). This means, of course, that the diploid number is 38, but usualy for clarity biologists reckon by the haploid number (the number of pairs in the somatic cells, or body cells, and the number of single chromosomes in the gametes or sex cells). Remember that the somatic cells and the sex cells reproduce by different methods - the former uses mitosis, and the latter uses meiosis.

Or why not change the chromosomes of chimps and apes? It would appear, according to ID, that humans are the most important aspect of life on Earth. It shouldn't particularly matter if other lifeforms are changed in one way or another. (This assumes that the designer could not perform the aforementioned task of creating different chromosomes and methods to result in the same lifeform. Presumably, however, something capable of creating all life would be capable of this.

DNA (genes) when combined with histones and nonhistone chromosomal proteins is known as chromatin. The role of these proteins is to "pack up" the DNA into a nucleosome so that it can be organised into chromosomes. Chromosomal DNA and Its Packaging in the Chromatin Fiber | Structural organization of the nucleosome | Nucleosomes as seen in the electron microscope |

Human chromosomes range in length from 51 million to 245 million base pairs. With few exceptions (e.g., red blood cells), each of the trillions of cells in the human body contains a complete set of chromosomes--the genome. If all the bases in the human genome were spread out 1 millimeter apart, they would extend from Memphis to Los Angeles.

The nucleus of most human cells contains two sets of chromosomes, one set given by each parent. Each set has 23 single chromosomes--22 autosomes and an X or Y sex chromosome. A normal female will have a pair of X chromosomes; a male will have an X and Y pair.

Chromosome size source: National Center for Biotechnology Information. Human Reference Sequence (from Build 33 of the Human Genome released April 14, 2003). <http://www.ncbi.nlm.nih.gov/genome/seq/> (September 2003).

Go to Chromosome Number of Different Species Web site and use their search tool to find out the number of chromosomes in several different organisms. Feedback and comments about this site, contact site designer, Jennifer Bownas of HGMIS. To order a poster, click here. Home Site Index Chromosome Viewer Genetic Disorder Guide Gene and Protein Guide Bioinformatics Tutorials

Chromosome 21, beta amyloid precursor protein gene, autosomal dominant, with age of onset between 45 to 65 years. Chromosomes 9, 10 and 12. These unknown genes have weak effects; they do not always cause the disease unless more than one is present and/or there is an environmental trigger. Chromosome 19 has the apolipoprotein E gene that affects cell activity. The APOE gene found on chromosome 19 has three alleles: APOE eE2, APOE e3 and APOE e4.

Chromosomes can be seen under a light microscope and, when stained with certain dyes, reveal several features. Such features include length, position of a constricted region (centromere), and the particular patterns of light and dark bands that result from treatment with stains. Differences in size and banding pattern allow the 24 chromosomes to be distinguished from each other, an analysis called a karyotype.

It is possible. Just download any *.gbk or *.gbs file from the NCBI ftp-site. Simply click with the right mouse button onto e.g. the GenBank leaf or any subfolder to see the available options for adding information. We have tried several human, yeast, and c. elegans chromosomes. Be sure to have the latest release of Genesis (1.0.1), because only this release is able to import the latest files from NCBI. This version also supports *.gbs files (just the header information, without the sequence).

Chromosomes are the "packed up form" of DNA with bound protein (togenter called chromatin) which exist in the nucleus as a discrete number for all cells in an animal or plant. In a cell that is not actually dividing (in interphase) the DNA is unravelled and individual chromosomes cannot be seen. The DNA contains the gene sequences that are the basis of gene expression to form proteins. Have a look at Cell Chromatin the associated Chromatin image and a Chromosome table.

But obviously, your nutty little plan backfired when you tried to pass off mail order brides as vindication of what you call "caucasoid" Y chromosome carrying women. I need no corroboration for this, other than to say that, the thread is available for anyone to see for him/herself. Now, troll your tiny little greasy dago ass along, will you, borderline european. It is rare to find people of character and you have shown it.