0
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
What else can I help you with?
Sex chromosomes were first discovered in what organisms?
Sex chromosomes were first discovered in insects, specifically in fruit flies by Nettie Stevens and Edmund Wilson in 1905. They observed that the differences in male and female sex characteristics were due to the presence of these specialized chromosomes.
In the first division of meiosis that you just observed what happens to the number of chromosomes per cell?
In the first division of meiosis (meiosis I), the number of chromosomes per cell is reduced by half. This reduction occurs as homologous chromosomes separate, resulting in two daughter cells, each with half the number of chromosomes as the original parent cell.
What is the maximum number of chromosomes ever observed in a human individual?
Oh, dude, the maximum number of chromosomes ever observed in a human individual is 92. Yeah, that's like double the usual 46. It's a rare condition called tetrasomy, but hey, more chromosomes, more fun, right?
What are the key features of meiosis that can be observed under a microscope?
During meiosis, key features that can be observed under a microscope include the pairing of homologous chromosomes, crossing over between chromosomes, and the separation of chromosomes during cell division. These processes result in the formation of haploid cells with genetic variation.
Do chromosomes only occur in egg and sperm cells?
No, chromosomes are present in almost all cells of an organism. However, they are most readily observed in egg and sperm cells during sexual reproduction because they contain a single set of chromosomes.
Sex chromosomes were first discovered in what organisms?
Sex chromosomes were first discovered in insects, specifically in fruit flies by Nettie Stevens and Edmund Wilson in 1905. They observed that the differences in male and female sex characteristics were due to the presence of these specialized chromosomes.
Can chromosomes be seen in a cell that is observed in prophase?
Yes. During prophase the chromosomes condense to prepare for cell division.
In the first division of meiosis that you just observed what happens to the number of chromosomes per cell?
In the first division of meiosis (meiosis I), the number of chromosomes per cell is reduced by half. This reduction occurs as homologous chromosomes separate, resulting in two daughter cells, each with half the number of chromosomes as the original parent cell.
The physical appearance of the entire set of chromosomes of a given animal is called a what?
The physical appearance of the entire set of chromosomes of a given animal is called a karyotype. It was first defined by Levitsky.
What is the maximum number of chromosomes ever observed in a human individual?
Oh, dude, the maximum number of chromosomes ever observed in a human individual is 92. Yeah, that's like double the usual 46. It's a rare condition called tetrasomy, but hey, more chromosomes, more fun, right?
What are the key features of meiosis that can be observed under a microscope?
During meiosis, key features that can be observed under a microscope include the pairing of homologous chromosomes, crossing over between chromosomes, and the separation of chromosomes during cell division. These processes result in the formation of haploid cells with genetic variation.
What scientist discovered that sex chromosomes differ in size?
Nettie Stevens discovered that sex chromosomes differ in size in 1905. She observed that the sex chromosomes in mealworms determined the sex of the offspring.
What did Walter Sutton observe?
he observed that grasshopper body cells and sex cells have the same number of chromosomes
Who discovered chromosome?
Chromosomes were first discovered by the scientist Walter Flemming in the late 19th century. Flemming observed and described the thread-like structures in the nucleus of cells, which we now know to be chromosomes.
What year was education month first observed?
when education month was first observed
What is the most frequently observed phase in mitosis?
M [mitosis]-phase follows both Growth-phase 1 and [dna synthesis] S-phase; the transition between S-phase and M-phase involves the condensation of chromatin into chromosomes, and what is frequently observed is the movement, translocation, separation [division] and migration of the two sets of chromosomes to the two Cellular/nuclear 'poles'. This is very quickly followed by Cellular binary fission.
What is the first plant cell found?
First cell observed was a cork cell.So it was the first plant cell observed.
