STD 12 - 7. human health and disease — BIOLOGY STD 12 Science — Question

$I.$ The bacteria Bacillusthuringiensis $(B t)$ are used to control butterfly catterpillers

$II.$ Fresh spores of $B t$ are mixed with water and sprayed on seeds such as brassicas and fruit trees

$III.$ Insect larvae, after eating these are killed by the toxin released in their gut

$IV.$ Bt toxin genes have been introduced into plants to provide resistance to pests

Which of the statements given above are correct?

$(i)$ Sickle - cell anaemia is controlled by three pairs of allele.

$(ii)$ Trisomy is chromosomal disorder.

$(iii)$ $47$ chromosome present in person whose having Turner's syndrome.