Question

A brief reduction in size of population due to natural calamaties leads to random genetic drift. For this statement identify the correct example :

• A. Long neck Giraffe
• B. Industrial melanism
• C. Human population of Pitcarin Island
• D. Polydactylic dwarfs in Amish Population

Answer 1

Answer: (D)

Polydactylic dwarfs in Amish Population

• A brief reduction in size of population due to natural calamaties leads to random genetic drift resulting in founder effect.
  
• Polydactylic dwarfs suffer from Ellis–van Creveld syndrome which is the result of founder effects in isolated human populations in Amish. Although relatively rare, this disorder does occur due to lack of genetic variability.
  
• It is characterized by Post-axial polydactyly, Congenital heart defects, natal teeth, Fingernail dysplasia.
  

So, the correct answer is 'Polydactylic dwarfs in Amish Population'