Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

$\begin{array}{lll}\text{Abnormality}& \text{Cause}& \text{Characteristic}\\ \begin{array}{l}\text{Down’s syndrome}\end{array}& \begin{array}{l}\text{Trisomy of 21st autosome}\\ (45A+XX/XY)\end{array}& \begin{array}{l}\text{Mental retardation,}\\ \text{prominent head,}\\ \text{flattened nasal bridge,}\\ \text{habitually open mouth}\\ \text{and projecting lower lips}\end{array}\\ \begin{array}{l}\text{Turner’s syndrome}\end{array}& \begin{array}{l}\text{Non-disjunction}\\ \text{of sex chromosome}\\ \left(\genfrac{}{}{0ex}{}{2n=45}{44\mathrm{A}+\mathrm{XO}}\right)\end{array}& \begin{array}{l}\text{Sterile female, webbed}\\ \text{neck, no breast}\\ \text{development, no}\\ \text{menstruation or egg}\\ \text{production}\end{array}\\ \begin{array}{l}\text{Klinefelter’s syndrome}\end{array}& \begin{array}{l}\text{Non-disjunction}\\ \text{of sex chromosome}\\ \left(\genfrac{}{}{0ex}{}{2n=47}{44\mathrm{A}+\mathrm{XXY}}\right)\end{array}& \begin{array}{l}\text{Gynecomastia in males,}\\ \text{mentally defective,}\\ \text{testes underdeveloped}\end{array}\\ \begin{array}{l}\text{Sickle cell anaemia}\end{array}& \begin{array}{l}\text{Molecular gene}\\ \text{mutation of gene}\\ {\mathrm{Hb}}^{\mathrm{A}}\end{array}& \begin{array}{l}\text{Sickle-shaped RBCs, do}\\ \text{not transport }{\mathrm{O}}_2\\ \text{efficiently}\end{array}\end{array}$