Which of the following statements are correct regarding chromosomal basis of sex determination?
i. The mechanism of sex determination in insect is XX - XO type.
ii. In honey-bee, haplo-diploid type of sex determination is observed.
iii. Human males have homomorphic sex chromosomes.
iv. Human females have heteromorphic sex chromosomes.
v. Chromosomal mechanism of sex determination in birds is ZW-ZZ type.