Absence of which chromosome causes Turner's syndrome ?

What is Turner's syndrome ?

Down’s syndrome.

What is Down's syndrome ?

Which is the genotype of Turner's syndrome?

Choose the correct answer from the choices give under each bit./Given the answer in one word only. Which one is correct about Turner's syndrome ?

Trisomy of which chromosome is responsible for Edward's syndrome ?

What is the chromosomal formula for Turner's syndrome?

Match column I with column II and select the correct option from the given codes {:(,"Column I",,"Column II"),("A.","Chromosomal aberration","(i)","An additional sex chromosome"),("B.","Down' syndrome","(ii)","Inversion"),("C.","Klinefelter's syndrome","(iii)","Presence of an extra chromosome"),("D.","Turner's syndrome","(iv)","Absence of sex chromosome"):}