$\begin{array} {ll}
\textbf{Disorder} & \textbf{Trait}\\
\text{1. Down's syndrome} & \text{a. XO in 45} \\
\text{2. Kiefelter's syndrome}& \text{b. trisomy of 21}\\
\text{3. Turner's Syndrome} & \text{c. additional copy of X - Chromosomes}
\end{array}$
( a ) 1-a,2-b,3-c
( b ) 1-b,2-a,3-c
( c ) 1-b,2-c,3-a
( d ) 1-a,2-c,3-b
