डाउन सिंड्रोम क्या है | down syndrome in hindi class 12 biology | down syndrome ke lakshan Mongolism

डाउन सिन्ड्रोम के लक्षण भी बताएं हैं, इन व्यक्तियों का चेहरा मंगोलों के समान होने के कारण इसे मंगोलियन जड़बुद्धिता (Mongolian idiocy) भी कहते हैं।
मनुष्य में सामान्यतः गुणसूत्रों की संख्या 46 होती है, इनमें 44 दैहिक गुणसूत्र (ऑटोसोम्स) तथा दो लिंग गुणसूत्र (sex chromosomes) होते हैं। उत्परिवर्तन के कारण गुणसूत्रों की अपसामान्य संख्या बच्चों में देखने में आती है।
डाउन्स सिन्ड्रोम/मंगोलिज्म (Down's syndrome or Mongolism) : सन् 1866 में इंग्लैण्ड के लैंगडन डाउन (Langdon Down) ने मंगोली जड़ता/जड़बुद्धिता (Mongoloid idiocy) रोग का अध्ययन कर, इन व्यक्तियों के गुणसूत्रों की ट्राइसोमिक अवस्था (trisomic stage) का वर्णन किया था।
डाउन सिंड्रोम क्या है | डाउन सिंड्रोम के लक्षण | down syndrome in hindi class 12 biology | Mongolism
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