diploid chromosomes in humans

In the diploid number, chromosomes are always found in pairs. In each pair there are two identical chromosomes, called homologous chromosomes. These chromosomes are identical in size, appearance and position of the centromere. Apart from this, the t..

The number of chromosomes is fixed for a given species. It varies from a minimum of two to several hundreds in different species of plants and animals. All individuals of a given species show the same chromosome number in all their body cells. The number of chromosomes..

The exact number of somatic chromosomes in man was not known till 1956. New techniques of staining chromosomes have revealed the exact number and this have greatly helped the study of human genetics. Using the karyotyping techniques the form, shape and size of all the ..

As can be seen from the human karyogram, the chromosomes are classified into two types, autosomes and sex chromosomes. The autosomes have homologous chromosomes as pairs whereas the sex chromosomes are of two different types - X and Y. A female has ..

The techniques of cultivating human cells in specific media and the techniques used in somatic cell genetics have enabled geneticists to understand the biochemical basis of the inheritance of many characters. Division of the human cells in the cell culture is arrested at the met..

It involves the addition or deletion of one or a few chromosomes from the usual diploid set of chromosomes..

An organism, in which number of complete chromosome sets is more than the diploid number is called polyploi..

Man has 46 chromosomes, and these occur in pairs i.e., diploid condition. Two types of cell divisions take place. MITOSIS (Diploid division) MEIOSIS (Haploid division..

In unisexual organisms, the chromosomes can be distinguished into autosomes and allosomes. Autosomes or somatic chromosomes carry genes which determine the somatic characteristics and do not have any influence on determining the sex of the organism. Allosomes are sex ..

Meiosis is a cell division occurs in reproductive cells (gametes). The male gamete is known as the sperm in animals and the female gamete is known as the ovum (egg). These gametes, after they are formed, have no future unless they unite to form a zygote, which then grows into an adult organism. The..