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Chromosomes were first observed in plant cells by Swiss botanist Karl Wilhelm von N?geli in 1842, and independently in Ascaris worms by Belgian scientist Edouard Van Beneden (1846-1910). The use of basophilic aniline dyes was a fundamentally new technique for effectively staining the chromatin material in the nucleus. Their behavior in animal (salamander) cells was later described in detail by German anatomist Walther Flemming, the discoverer of mitosis, in 1882. The name was invented later by another German anatomist, Heinrich von Waldeyer
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In the first division of meiosis that you just observed what happens to the number of chromosomes per cell?
It depends on what the animal or plant is. For humans, the first division results in 23 chromosomes per cell
What part of a cell would you study if you wanted to observe chromosomes?
Chromosomes are found only in the nucleus of the cell. Although they are actually observed as chromatinthroughout most of the cell's life the chromatin does condense into chromosomes during mitosis/meiosis.
Sex chromosomes were first discovered in what organisms?
sex chromosomes were first discovered in what organism
What type of disorders are karyotyping used to diagnose?
Chromosomal disorders can be observed in a human karyotype. It can show whether there are extra chromosomes, or missing chromosomes, or malformed chromosomes, or whether chromosomes have extra pieces, or missing pieces.
Doubled chromosomes first become visile in which step of mitosis?
double chromosomes first become visible in which step of mitosis?
In the first division of meiosis that you just observed what happens to the number of chromosomes per cell?
It depends on what the animal or plant is. For humans, the first division results in 23 chromosomes per cell
Can chromosomes be seen in a cell that is observed in prophase?
Yes. During prophase the chromosomes condense to prepare for cell division.
Why are chromosomes sometimes drawn as a striaght line and other times in an x configuration?
Because those are the shapes of the individual chromosomes observed under an optical microscope.
Number of chromosome observed in each nucleus of the cells in animal mitosis model?
The number of chromosomes depends on which species of animal was used in your modle.
What part of a cell would you study if you wanted to observe chromosomes?
Chromosomes are found only in the nucleus of the cell. Although they are actually observed as chromatinthroughout most of the cell's life the chromatin does condense into chromosomes during mitosis/meiosis.
What did Walter Sutton observe?
he observed that grasshopper body cells and sex cells have the same number of chromosomes
What year was education month first observed?
when education month was first observed
Sex chromosomes were first discovered in what organisms?
sex chromosomes were first discovered in what organism
What is the first plant cell found?
First cell observed was a cork cell.So it was the first plant cell observed.
What is observed in a karyotype?
A karyotype is basically a chart of the number and structure of chromosomes. They can reveal ploidy differences (missing or additional chromosomes such as trisomy 21) or chromosomal mutations (like inversions, deletions, translocations etc)
What type of disorders are karyotyping used to diagnose?
Chromosomal disorders can be observed in a human karyotype. It can show whether there are extra chromosomes, or missing chromosomes, or malformed chromosomes, or whether chromosomes have extra pieces, or missing pieces.
Chromosomes other than X and Y?
Chromosomes that are not X or Y are called homologous chromosomes and autosomal chromosomes. The first 22 pairs of human chromosomes are autosomal.
