Match column 1 with column 2 :

A-ii, B-iii, C-iv, D-i

The correct answer is Option (4)- A-ii, B-iii, C-iv, D-i

Here's the matching of items in Column 1 with their corresponding items in Column 2:

A. Turner's syndrome - ii. AA + XO

Explanation: Turner's syndrome is caused due to the absence of one of the X chromosomes, i.e., 45 with X0, Such females are sterile as ovaries are rudimentary besides other features including lack of other secondary sexual characters

B. Linkage - iii. Morgan

Explanation: The concept of linkage in genetics was extensively studied by Thomas Hunt Morgan, particularly in his work with fruit flies (Drosophila).

C. Haemophilia - iv. X linked

Explanation: Hemophilia is a genetic disorder caused by a mutation in genes on the X chromosome and is inherited in an X-linked recessive manner.

D. Down's syndrome - i. Trisomy

Explanation: Down syndrome results from an extra copy of chromosome 21, known as trisomy 21, where there are three copies of chromosome 21 instead of the usual two.