3638
A relatively high frequency of carriers ( 1 / 27 ) of a lethal , infantile form of the disease is found in the Ashkenazi Jewish population , but it is not yet evident whether this has resulted from a founder effect and random genetic drift or from a selective advantage of heterozygotes .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None