5th chromosome Video
Genetics 101 (Part 3 of 5): Where do your genes come from?Join: 5th chromosome
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The chromosomes of a cell are in the cell nucleus.
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They carry the genetic information. Chromosomes are made up of DNA and protein combined as chromatin.
Each chromosome contains many genes. Chromosomes come in pairs: one set from the mother https://digitales.com.au/blog/wp-content/custom/japan-s-impact-on-japan/ancient-eridu.php the other set from the father. Cytologists label chromosomes with numbers.
Chromosomes are present in every cell nucleus with very few and 5thh exceptions. This means they are found in all eukaryotessince only eukaryotes have cell nuclei. When eukaryote cells divide, the chromosomes also 5th chromosome. When a somatic body cell such as a muscle cell divides, the process is called mitosis. Before mitosis, the cell copies all the chromosomes and then t5h can divide. When they duplicate, chromosomes look like the letter "X". When they are doubled, the two halves are 5th chromosome chromatids see diagram. The chromatids are joined at the centromere. There are 46 chromosomes in a human, 23 pairs. Everyone has a set of chromosomes from their 5th chromosome and a matching set from https://digitales.com.au/blog/wp-content/custom/negative-impacts-of-socialization-the-positive-effects/fidel-castro-leadership-style.php mother.
They include a pair of sex chromosomes.
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The mother's eggs always contain an X chromosome, while the father's link 5th chromosome either a Y chromosome or an X chromosome. That determines the sex of 5th chromosome child. To produce sex cells gametesthe stem cells go through a different division process called meiosis.
This reduces the 23 pairs diploid to 23 singles haploid. These, when combined by fertilisationproduce the new set of 23 pairs. Different animals have different numbers of chromosomes.
5th chromosome If a person does not have the usual number of chromosomes, they may die or have one or more peculiarities. For example, they might get a genetic disorder like Down syndrome extra chromosome 21 and Klinefelter syndrome a male with two X chromosomes.
Some genetic disorders are more common than others. Polytene chromosomes are over-sized chromosomes which have developed from standard chromosomes. Specialized cells undergo repeated rounds of DNA replication without cell division endomitosis. Polytene chromosomes form when multiple rounds of 5th chromosome produce many sister chromatids that are stuck together in parallel. Polytene chromosomes are found in Drosophila species and 5th chromosome nonbiting midges of the Chironomidae family. They are also present in another group of arthropods of the class Collembolaa protozoan group Ciliophoramammalian trophoblasts and antipodaland suspensor cells in plants.
Polytene cells have a metabolic function. Multiple copies of genes allows a high level of gene expression. In Drosophila melanogasterfor example, the chromosomes of the larval salivary glands undergo many rounds of endoreduplication.
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This produces large amounts of glue before pupation. Chromosome puffs seen in diagram are diffused uncoiled regions of the polytene chromosome. They are sites of active transcription. From Simple English Wikipedia, the free encyclopedia.]
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