A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.
Name the calls HIV (Human Immunodeficiency Virus) gains entry into after infecting the human body. Explain the events that occur in these cells.
Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they called so?
Following are the features of genetic codes. What does each one indicate ? 
Stop codon; Unambiguous codon; Degenerate codon; Universal codon.