Botany-Mendel's Laws
NEET Botany Mendel's Laws MCQ Question
Type: MCQ-fact-Medium-Class 12
What genetic disorder is characterized by the presence of an additional copy of chromosome number 21?
A
Down's syndrome
B
Turner syndrome
C
Klinefelter syndrome
D
Sickle cell anemia
Correct Answer
Option A
Detailed Explanation
Down's syndrome is caused by trisomy of chromosome 21, leading to distinct physical traits and developmental challenges. This genetic disorder was first described by Langdon Down in 1866.
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