how many chromosomes do humans have

There are chromosomes which are extremely large compared to normal chromosomes. Such chromosomes, called giant chromosomes occur in some animal cell..

The size of chromosomes varies from species to species. In the same species, all the chromosomes occurring in a given cell will not be of the same size. However, in most organisms, chromosomes fall in the size range of 0.1 to 30 μm in length and 0.2 to 2.0 μm ..

Chromosomes and Centromere - Centromere is the primary constriction in the chromatid of a chromosome where the spindle tubules become attached during cell division. A chromosome generally has only one centromere and such a chromosome is described as monocentr..

Centromere is the primary constriction in the chromatid of a chromosome where the spindle tubules become attached during cell division. A chromosome generally has only one centromere and such a chromosome is described as monocentric. Sometimes two centromeres may occur..

The chromatin material just before cell division forms into chromosomes. Each chromosome is made up of two longitudinal strands called the chromatids. Structure of Chromosome Each chromatid has a double helical DNA molecule. The two chromatids are held together by a st..

The chromatin material just before cell division forms into chromosomes. Each chromosome is made up of two longitudinal strands called the chromatid..

Prokaryotic cells lack nuclear membrane and the genetic material is found in a compact region called nucleoid. The chromosome is made up of DNA and has associated proteins. It is about 1.2 mm in length in the bacterium Escherichia coli. The chromosome is highly coiled and super ..

The eukaryotic cells show a varied number of chromosomes. It is presumed to be the result of breaking up of a single long chromosome into several short units, in the course of evolution, to accommodate the increase in the amount of genetic information. The eukaryotic ..

The most ideal stage to study the structure of chromosomes is the metaphase of mitosis. A metaphase chromosome consist of two identical components called chromatids, which are held together at a specific region called primary constriction. It is usually found in the centre and h..

In bacteria, which being prokaryotic organisms, the entire hereditary material is packed into a single, irregularly folded compact mass called nucleoid or genophore or bacterial chromosome. It is short and simple consisting of a single DNA molecule. The DNA is in the form of a doubl..