humans dna

DNA Finger Prints - The technique of finger printing was perfected by British genetist Dr. Alec Jeffreys in 1984. fig. 25.9 Identical Twins No two people (other than identical twins) have exactly the same sequence of bases in their DNA. By detecting these, the differences in ..

It is a comprehensive international effort started in 1990 by molecular biologists to map the entire human genome by determining the complete nucleotide sequence of DNA of each chromoso..

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 two X-chromosomes and a male has an X a..

. Vehicle (vector) DNA is the DNA which carries the passenger DNA to the new host. It is usually the plasmid from bacterial or a bacteriophage. Various enzymes such as lyases, ligases, alkaline phosphates, reverse transcriptases and nucleases are used in the technology..

Genetic engineering can be described as an in vitro manipulation of genes. It refers to artificial synthesis, modification, removal, addition and repair of the genetic material (DNA) to alter the genotype at will. It has evoked great interest because it may enable the geneticists in..

Gene Manipulation (Genetic Engineering) - Genetic engineering can be described as an in vitro manipulation of genes. It refers to artificial synthesis, modification, removal, addition and repair of the genetic material (DNA) to alter the genotype at will. It has evoked great interest beca..

The head is almost conical in the human sperm. It is formed of an acrosome and nucleus enclosed in a thin membrane. The acrosome forms a cap at the anterior end of the nucleus. It is formed from the golgi complex. It secrets tissue - dissolving lytic enzymes called hyaluronidase which hel..

It is a viral disease caused by the infection from a retrovirus , known as Human Immuno - deficiency Virus..

A chemical or other environmental agent that produces cancer is called a carcinogen. The world Health organisation estimates that carcinogens may be associated with 60 - 90% of all human cancer. Depending upon their mode of action carcinogens are of 3 types. (1) Carcinogens that cause alt..

We have discussed many dramatic effects of hormone, for instance, testosterone. Yet, its concentration in the plasma of adult human male is only 30 to 100 ng per ml. How can hormones in such tiny quantities have such widespread and selective actions? Unlike catecholamine and peptide horm..