Navigation Links
Homologous chromosomes


homologous chromosomes
a pair of chromosomes, one from each parent, that have relatively similar structures and gene values
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Full article >>>

Homologous chromosomes have corresponding DNA sequences and come from separate parents; one homolog comes from the mother and the other comes from the father. Homologous chromosomes line up and synapse during meiosis.
Full article >>>

Homologous chromosomes derived from maternal and paternal gamete nuclei come together and pair up. They have same lengths, same centromere positions and in most cases same number of genes arranged in linear order.
Full article >>>

Homologous Chromosomes
Diploid organisms have two copies of each chromosome (except the sex chromosomes). Each pair of chromosomes is homologous. For example, the two #7 chromosomes are homologous.
Full article >>>

homologous chromosomes
(home-ol-uh-gus) [Gk. homologia, agreement]
Chromosome pairs of the same length, centromere position, and staining pattern that possess genes for the same characters at corresponding loci.
Full article >>>

homologous chromosomes Chromosomes that exist in pairs; each homologue possesses the same genes or loci, but the homologues may have different alleles at the same locus; one member of each pair comes from each parent.
Full article >>>

Homologous chromosomes. Chromosomes that have the same linear arrangement of genes--a pair of matching chromosomes in a diploid organism. See Chromosomes.
Full article >>>

homologous chromosomes
chromosome pairs of the same length centromere position, and staining pattern that possess genes for the same traits at corresponding loci.
Full article >>>

Homologous chromosomes: A pair of chromosomes containing the same linear gene sequences, each derived from one parent.
Full article >>>

A pair of homologous chromosomes closely adjacent to each other formed during the first meiotic division within a primary spermatocyte or oocyte.
Full article >>>

chromatid: homologous chromosomes joined to each other at the centromere; present during the prophase of mitosis.
chromatin: compacted DNA and protein.
chromosomes: linear units of DNA.
Full article >>>

Any pair of homologous chromosomes may be expected to cross over multiple times during meiosis, depending on the species and length of the chromosome.
Full article >>>

In meiosis, homologous chromosomes line up. The DNA of the chromosome is broken on both chromosomes in several places and rejoined with the other strand.
Full article >>>

: Separation of homologous chromosomes during anaphase of mitotic or meiotic divisions (see also
nondisjunction
).
Disposable soma theory ...
Full article >>>

During Metaphase I, homologous chromosomes will line up. A karyotype can be made by cutting and arranging photomicrographs of the homologous chromosomes thus revealed at Metaphase I. Two types of chromosome pairs occur.
Full article >>>

Alternate forms of a gene or DNA sequence, which occur on either of two homologous chromosomes in a diploid organism. (See DNA polymorphism.) Alternative mRNA splicing. The inclusion or exclusion of different exons to form different mRNA transcripts.
Full article >>>

[More] Tetracycline antibiotics Tetracycline response element Tetrad(1) The duplicated homologous chromosomes held together by chiasmata prior to anaphase of meiosis I. Each tetrad contains four chromatids.
Full article >>>

Homologous chromosomes -- chromosomes that pair during meiosis; each homologue is a duplicate of one chromosome from each parent. Homozygote -- having identical alleles at one or more loci in homologous chromosome segments.
Full article >>>

Some organisms are diploid - that is, they have paired homologous chromosomes in their somatic cells, and thus contain two copies of each gene.
Full article >>>

In the first division (meiosis I), homologous chromosomes pair and segregate to daughter cells. In the, second division (meiosis II), sister chromatids segregate.
Full article >>>

During the prophase of meiosis I, homologous chromosomes pair and form synapses. The paired chromosomes are called bivalents. The bivalent has two chromosomes and four chromatids, with one chromosome coming from each parent.
Related Terms: Prophase ...
Full article >>>

Bivalent a pair of homologous chromosomes during meiosis also known as a tetrad
(bi = two; valent = strength)
Blastocyst the hollow ball stage of embryonic development
(blasto = bud sprout) ...
Full article >>>

Synapsis
The pairing of homologous chromosomes or of homologous chromosomal regions.
Synteny
Genes which occur in the same order on the chromosome of different species.
Full article >>>

Heterozygosity The presence of different alleles at one or more loci on homologous chromosomes.
Heterozygote See: heterozygosity ...
Full article >>>

and fungi) having one-half of the genetic material of the original cell. The nuclear and cell division process in diploid eukaryotes that results in four haploid gametes or spores having one member of each original pair of homologous chromosomes only ...
Full article >>>


'"/>


Other biology dictionary
(Date:7/23/2008)... into a domestic renewable fuel source could gener...t of North America,s entire consumption needs and ...emissions (GHGs), according to US research publish...hysics, Environmental Research Letters . , The ...s Benefits of Converting Manure to Biogas, has im...
(Date:7/23/2008)... living in three estuaries on the Pacific coast of...determined that biomass of these parasites exceeds... 20 times. , Their findings, which could have si...appear in this week,s issue of the journal Nature... exists in a given habitat. It is expressed either...
(Date:7/23/2008)...Institute of Standards and Technology (NIST) have ...clumps of proteins in protein-based pharmaceutical...itions under which scientists can be assured that ...mation of protein aggregates, a major concern beca... biologic drug manufacturing. , Proteins, a main...
(Date:7/23/2008)...n study of top-selling laundry products and air fr...erent chemicals. All six products tested gave off ...ous under federal laws, but none of those chemical...t interested in this topic because people were tel...s and the scent from laundry products vented outdo...
Breaking Biology News(10 mins):Cow power could generate electricity for millions 2Parasites outweigh predators in Pacific Coast estuaries 2Parasites outweigh predators in Pacific Coast estuaries 3NIST trumps the clumps: Making biologic drugs safer 2Toxic chemicals found in common scented laundry products, air fresheners 2Toxic chemicals found in common scented laundry products, air fresheners 3Palatin Technologies Initiates Phase 2 Hypertension Clinical Study With PL 3994 2129 1Palatin Technologies Initiates Phase 2 Hypertension Clinical Study With PL 3994 2129 2Palatin Technologies Initiates Phase 2 Hypertension Clinical Study With PL 3994 2129 3Delcath Updates Phase III Patient Enrollment as Pivotal Trial Accelerates Durable Tumor Responses In Phase II Study Also Cited 2127 1Delcath Updates Phase III Patient Enrollment as Pivotal Trial Accelerates Durable Tumor Responses In Phase II Study Also Cited 2127 2Delcath Updates Phase III Patient Enrollment as Pivotal Trial Accelerates Durable Tumor Responses In Phase II Study Also Cited 2127 3Rifampin 3A Latent TB treatment saves time money and lives 19832 1Rifampin 3A Latent TB treatment saves time money and lives 19832 2Clinical Solutions Subscribes to NetSuite for Global Healing of Disparate Operations 19830 1Clinical Solutions Subscribes to NetSuite for Global Healing of Disparate Operations 19830 2Clinical Solutions Subscribes to NetSuite for Global Healing of Disparate Operations 19830 3Clinical Solutions Subscribes to NetSuite for Global Healing of Disparate Operations 19830 4
...s M. D. Anderson Cancer Center have created a new ... to find, highlight, and deliver genes to tumors i... the journal Cell, is potentially an important ste...essible to treatment; it may also allow prediction... are actually working. , "In tumor-bearing mice, ...
...ped for detecting SCID (primary immunodeficiency) ...he first time at the New York Academy of Sciences,...e, Primary Immunodeficiencies: Past, Present, Futu...ckefeller University, Caspary Auditorium, 1230 Yor...the world,s leading immunology investigators will ...
...switch in mammals that shifts the body,s fuel cons... torpor in mice, a research team led by scientists...ton reports in the Jan. 19 edition of Nature. , ...o mammalian hibernation, researchers note that the...rk also presents a new target for obesity and type...
...erial pathogen Haemophilus influenzae was publishe...omplex, medically, and commercially significant or... , However, the techniques used to derive these ge...s may be unaware of potential errors lurking withi... sequence. If an organism,s genome is unstable, v...
Other Biology News:New hybrid virus provides targeted molecular imaging of cancer 2First SCID gene chip to be introduced at Academy meeting on immunodeficiencies 2First SCID gene chip to be introduced at Academy meeting on immunodeficiencies 3Darkness unveils vital metabolic fuel switch between sugar and fat 2Darkness unveils vital metabolic fuel switch between sugar and fat 3Study suggests that publicly available genome data may contain small but significant errors 2