APSC Prelims and Mains Notes, APSC Test Series
Chromosomes Chromosome, the microscopic threadlike part of the cell that carries hereditary information in the form of genes. A defining feature of any chromosome is its compactness. For instance, the 46 chromosomes found in human cells have a combined length of 200 nm (1 nm = 10− 9 metre); if the chromosomes were … Read more
Mitosis When the chromosomes condense during cell division, they have already undergone replication. Each chromosome thus consists of two identical replicas, called chromatids, joined at a point called the centromere. During mitosis the sister chromatids separate, one going to each daughter cell. Chromosomes thus meet the first criterion for being the repository of genes: they … Read more
Gene Chromosomes They are located on the chromosomes. Chromosomes are the packed structure of a DNA with proteins. Genes are composed of either DNA or RNA Chromosomes composed of DNA, RNA and histones. According to Human genome project, there are 30,000 genes in the human cell. In Human cell there are 23 pair of … Read more