holocentric chromosome definition
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- holocentric chromosome. (genetics). A chromosome with centromer; activity/spread along its entire length.1  Facebook.olocentric chromosome. (genetics). A chromosome with centromer; activity/spread along its entire length. 1  Facebook.
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Centromere and Chromosome Segregation The position of the centromere is readily observable in a human karyotype of homologous chromosomes. Chromosome 1 is an example of a metacentric centromere, chromosome 5 is an example of a submetacentric centromere, and chromosome 13 is an example of an acrocentric centromere. Chromosome Segregation in Mitosis
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X chromosome Medical Definition of X chromosome. : a sex chromosome that usually occurs paired in each female cell and single in each male cell in species in which the male typically has two unlike sex chromosomes—compare y chromosome.
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Chromosome Structure and Function By Regina Bailey. Definition: A chromosome is a long, stringy aggregate of genes that carries heredity information (DNA) and is formed from condensed chromatin.A non-duplicated chromosome is single-stranded and is comprised of a centromere region that connects two arm regions.hare. By Regina Bailey. Definition: A chromosome is a long, stringy aggregate of genes that carries heredity information (DNA) and is formed from condensed chromatin. A non-duplicated chromosome is single-stranded and is comprised of a centromere region that connects two arm regions.
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- Robertsonian translocation: A common and significant type of chromosome rearrangement that is formed by fusion of the whole long arms of two acrocentric chromosomes (chromosomes with the centromere near the very end).
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- The centrosome or centrosphere is usually regarded as the dynamic centre of the cell and a special organ of division; but its absence in many groups of plants does not lend support to this view so far as plant-cells are concerned.
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centromere centromere The constriction in a chromosome at which the two identical halves (chromatids) of the newly longitudinally-divided chromosome are joined, and at which the chromosome attaches to the spindle fibre during division (mitosis). The centromere contains no genes. centromere
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Chromosome Structure and Function Updated July 08, 2016. Definition: A chromosome is a long, stringy aggregate of genes that carries heredity information and is formed from condensed chromatin. Chromatin is composed of DNA and proteins that are tightly packed together to form chromatin fibers. Condensed chromatin fibers form chromosomes.
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- Definition: A chromosome is a long, stringy aggregate of genes that carries heredity information (DNA) and is formed from condensed chromatin.
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chromosome Noun. 1. chromosome-a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; humans have 22 chromosome pairs plus two sex chromosomes. cell nucleus, karyon, nucleus-a part of the cell containing DNA and RNA and responsible for growth and reproduction.. A linear strand of DNA and associated proteins in the nucleus of eukaryotic cells that carries the genes and functions in the transmission of hereditary information. 2. A circular strand of DNA in bacteria and archaea that contains the hereditary information necessary for cell life.
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- Today, however, the word chromosome refers to a length of DNA in a cell's nucleus that is individually replicated, stores information and has a microtubular attachment site called a centromere.
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CHROMOSOME Hyponyms (each of the following is a kind of chromosome): sex chromosome ((genetics) a chromosome that determines the sex of an individual). autosome; somatic chromosome (any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa).acentric chromosome (a chromosome lacking a centromere).he noun CHROMOSOME has 1 sense: 1. a threadlike body in the cell nucleus that carries the genes in a linear order. Familiarity information: CHROMOSOME used as a noun is very rare.
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- The occurrence of one or more extra or missing chromosomes leading to an unbalanced chromosome complement, or, any chromosome number that is not an exact multiple of the haploid number.Definition from: GeneReviews from the University of Washington and the National Center for Biotechnology Information.he occurrence of one or more extra or missing chromosomes leading to an unbalanced chromosome complement, or, any chromosome number that is not an exact multiple of the haploid number.
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Hox Genes in Development: The Hox Code The Hox genes are a set of transcription factor genes that exhibit an unusual property: They provide a glimpse of one way in which gene expression is translated into the many different forms that animals (metazoans) exhibit.he Hox genes are early actors in the cascade of interactions that enable the development of morphologically distinct regions in a segmented animal. Indeed, the activation of a Hox gene from the 3' end is one of the earliest triggers that lead the segment to develop into part of the head.
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Karyotyping for Chromosomal Abnormalities For example, metacentric chromosomes, such as chromosomes 1, 3, and 16, have p and q arms of nearly equal lengths. Submetacentric chromosomes, such as chromosomes 2, 6, and 10, have centromeres slightly displaced from the center.
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Homologous Chromosomes - A Genetics Definition By Regina Bailey. Definition: Homologous chromosomes are chromosome pairs, one from each parent, that are similar in length, gene position, and centromere location. The position of the genes on each homologous chromosome is the same, however the genes may contain different alleles. Example: A human karyotype shows the complete set of human chromosomes. Human cells contain 23 pairs of chromosomes for a total of 46. Each chromosome pair represents a set of homologous chromosomes. In males, the sex chromosomes X and Y are homologues. In females, both X chromosomes are homologues.
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chromosome Definition of CHROMOSOME for Kids. : one of the rod-shaped or threadlike structures of a cell nucleus that contain genes and divide when the cell divides.hromosome. noun chro·mo·some \ˈkrō-mə-ˌsōm, -ˌzōm\. Tweet. : the part of a cell that contains the genes which control how an animal or plant grows and what it becomes.
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Chromosome A chromosome is a DNA molecule with part or all of the genetic material (genome) of an organism. Prokaryotes usually have one single circular chromosome, whereas most eukaryotes are diploid, like humans. Chromosomes in eukaryotes are composed of chromatin fiber. Chromatin fiber is made of nucleosomes. A nucleosome is a histone octamer with part of a longer DNA strand attached to and wrapped around it.
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What is the relationship between DNA, genes and chromosomes? A chromosome (from Greek: χρῶμα color and σῶμα body) is a packaged and organized structure containing most of the DNA of a living organism.
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Sister Chromatids: Definition and Example Definition: Sister chromatids are two identical copies of a single replicated chromosome that are connected by a centromere. Chromosome replication takes place during interphase of the cell cycle.
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Sex chromosome Definition. noun, plural: sex chromosomes. A type of chromosome in the genome that is involved in the determination of the sex as well as the development of sexual characteristics in an organism. It occurs in pairs in somatic cells while singly in sex cells . Supplement
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Centrosome In cell biology, the centrosome (Latin centrum 'center' + Greek sōma 'body') is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell as well as a regulator of cell-cycle progression. The centrosome is thought to have evolved only in the metazoan lineage of eukaryotic cells.
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- A chromosome (chromo- + -some) is a packaged and organized structure containing most of the DNA of a living organism.exually reproducing species have somatic cells (body cells), which are diploid [2n] having two sets of chromosomes (23 pairs in humans with one set of 23 chromosomes from each parent), one set from the mother and one from the father. Gametes, reproductive cells, are haploid [n]: They have one set of chromosomes.
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- holo-, hol-. (Greek: whole, entire, complete) holandric (hol AN drick, ho LAN drick) (adjective), more holandric, most holandric. Pertaining to genes that are carried by the Y chromosomes: The holandric genes are produced only through the paternal, or male, and never by the female..
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- During metaphase I, all of the doubled homologous chromosome pairs line up along the midline of the cell between the two centrioles. During anaphase I, the homologous chromosome pairs separate and are pulled to opposite poles of the cell by spindle fibers attached to the centrioles.
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- Definition: A chromosome is a long, stringy aggregate of genes that carries heredity information (DNA) and is formed from condensed chromatin.A non-duplicated chromosome is single-stranded and is comprised of a centromere region that connects two arm regions.hare. By Regina Bailey. Definition: A chromosome is a long, stringy aggregate of genes that carries heredity information (DNA) and is formed from condensed chromatin. A non-duplicated chromosome is single-stranded and is comprised of a centromere region that connects two arm regions.