Chromosomes, Biology

Chromosomes

  1. Karl Nageli and Hofmeister observed chromosomes in pollen mother cells of Tradescantia.
  2. Chromosome name proposed by Waldeyer.
  3. During cell division, chromatin threads become condensed to form thick structures called chromosomes.
  4. Structure of chromosomes can be best studied at metaphase stage as chromosomes are most condensed.
  5. Plant cell possess normally larger chromosomes then the animal cells. (Trillium have longest chromosomes 32 mm at metaphase).
  6. Monocot plants have larger chromosomes as compared to dicot plants.
  7. Haploid set of chromosomes alongwith all its genes are called genome. In somatic cells of animals and higher plants there are two genomes. Their gamets or gametophytic cells have one genome.
Posted Date: 10/8/2012 1:23:15 AM | Location : United States







Related Discussions:- Chromosomes, Assignment Help, Ask Question on Chromosomes, Get Answer, Expert's Help, Chromosomes Discussions

Write discussion on Chromosomes
Your posts are moderated
Related Questions
NE R VE IMPULSE (IT'S GENERATION) - It is an electro chemical phenomenon manifested through ionic movement across cell membrane. It was discovered by A. L. Hodykin & A

Explain chemical bonds in basic chemistry? Chemical Bonds :  Chemical bonds are forces that join atoms together in a functional unit. There are three types of bonds that can

An  osteoclast  is a type of bone cell that absorbs bone tissue by removing its mineralized matrix and breaking up the  organic bone. This process is known as bone resorption

1. The level of organization intermediate between unicellular and the multicellular - organisms are composed of multiple cells but these fail to exhibit specialization of those cel

Define Reaction of Fehling Soxhlet method? The reducing sugars formed are acted upon by the alkali of Fehling's solution to form enediols. These enediols are very unstable and

Phases of Karyokinesis: Karyokinesis can further be divided into prophase, metaphase, anaphase and telophase. 1-Prophase: (pro= before) Chromatin: During Interphase (non

An interesting observation made by an American biologist H.C. Bumpus (1899) provides a good explanation for normalising selection. Bumpus collected some 136 injured house sparrows

Compare and contrast acids and bases in terms of their H+ ion and OH- ion concentrations.

Management Goals Improve oxygenations and ventilation to restore the person/s Pa 2 O 2 and PaCO 2 , to their previous levels.  Understand the underlying cause.

Despite the technologic advances of recent years, many patients with chronic heart failure are elderly and have multiple comorbidities. Many of them will not experience meaningful