Question

The genetic make-up of a man was found to be XXY.

1. Name the syndrome the individual could be suffering from. 
2. Explain how the syndrome occurs. 
3.  
   • State how the chemical, colchicine induces polyploidy in plants.
   • State one advantage of polyploidy in wheat farming

Answer 1

1. Klinefeller's syndrome
2. Chromosomal abnormalities/ mutation resulting in addition of a whole chromosome. It occurs during meiotic division/meiosis where homologous chromosomes fail to segregate and move on to the same gamete cell/ If gamete wit XX fuses with gamete with Y, then offspring becomes XXY

   	X	Y
   XX	XXX	XXY
   O	XO	YO

   
    

3.   

   • Prevents spindle formation during cell division leading to cells with extra chromosome.
     
      

   • Drought/ pest/ disease resistant

   • High yields

   • Early maturity