Twelve › Biology › Linkage and crossing over
First of all you have to understand what basically an allele is: Alleles are different alternative forms of a gene ( gene is basically the smallest segment of DNA whi...
Twelve › Physics › Solid and semiconductor devices
Diode: When a p-type crystal is placed in contact with n-type crystal so as to form one piece, the assembly so obtained is called p-n junction or junction diode. The s...
Twelve › Physics › The electron
It is a modern X-ray tube . A coolidge tube is called so in honour of the scientist , William D. Coolidge . This tube was commonly used after the cold cathode tube . T...