$A.$ Variation at genetic level arises due to mutations.
$B.$ Technique of $DNA$ fingerprinting was initially developed by Alec Jeffreys
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$A$. Out of one pair of factors one is dominant and the other is recessive.
$B$. Alleles do not show any expression and both the characters appear as such in $F_2$ generation.
$C$. Factors occur in pairs in normal diploid plants.
$D$. The discrete unit controlling a particular character is called factor.
$E$. The expression of only one of the parental characters is found in a monohybrid cross.
Choose the correct answer from the options given below:
$I.$ Cancer can be detected by the use of antibodies against cancer specific antigens for certain type of cancer
$II.$ The tumor cells are surgically removed to reduce the load of cancerous cells
$III.$ Certain chemotherapeutic drugs are used to kill the cancerous cells, but majority of the drugs have side effects like hair loss, anaemia, etc.