Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2017
Exam
NEET
Year
2017
Subject
Zoology
Chapter
Principles of Inheritance and Variation

NEET 2017 · Zoology · Principles of Inheritance and Variation

A disease caused by an autosomal primary non-disjunction is

A disease caused by an autosomal primary non-disjunction is

Options

  1. ADown's syndrome
  2. BKlinefelter's syndrome
  3. CTurner's syndrome
  4. DSickle cell anemia

Correct answer

A. Down's syndrome

Step-by-step solution

Non-disjunction is the failure of homologous chromosomes to disjoin or separate and move away to opposite poles. Non-disjunction of the 21st chromosome during oogenesis is the cause of Down's syndrome. It occurs due to the presence of an additional copy of chromosome no. 21 (trisomy of 21st chromosome) is humans.

Practice Principles of Inheritance and Variation on Quantrex Academy →

More from Principles of Inheritance and Variation

Match List I with List II : List I List II A. Incomplete dominance I. Human skin colour… NEET 2026The sixth mutant codon of beta globin gene causing polymerization of Haemoglobin and… NEET 2026In a population of a grasshopper species, the chromosome number of some members is 23 and… NEET 2026Which one of the following disorders is caused by the substitution of Glutamic acid (Glu)… NEET 2026What is the probability of having children with 'O' blood group, where both mother and… NEET 2026Given below are two statements : one is labelled as Assertion A and the other is labelled… NEET 2026Given below are two statements : Statement I : Down's syndrome is caused by the absence… NEET 2026Which of the following statements are true with reference to the sex-determination in… NEET 2026 Full Principles of Inheritance and Variation list All NEET PYQs