NEET UG · Biology · Principles of Inheritance and Variation
Sex Determination and Genetic Disorders: NEET previous year questions
15 questions in ten years of NEET, in 9 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.
- Asked in 10 years
- 15
- about 1.4 per paper
- Years asked
- 9/10
- last asked 2026
- Weighted estimate
- 1.3
- model; history: 1.4 a paper on average, typically 1–3
Key findings
- 01
Asked in 9 of 10 papers, 15 questions in all: #37 of 204 topics by ten-year total. It comes back every 1.1 years on average.
- 02
54% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
- 03
The most repeated idea is Down, Klinefelter and Turner Syndromes, asked 4 times (2019, 2023, 2026), usually as “count correct statements on a genetic disorder”.
- 04
NEET has asked 0 of the 10 ideas in this topic; 0 have never been asked, directly or indirectly.
- 05
Mostly asked as one-line MCQ (67%); 47% easy, 0% hard, and down from 1.6 to 1.0 questions a paper since 2024.
Questions per year
- Up to 2023
- 1.6
- per paper
- Since 2024
- 1.0
- -0.7
- Usual gap
- 1.1 yrs
- between papers asking it
- Swing
- ±0.8
- questions, year to year
Revise first
Down, Klinefelter and Turner Syndromes (2019 2023 2026); Mendelian Disorders and Their Loci (2020 2024); Pedigree Carrier Probability (2025)
How it is asked
Difficulty, format and skill
Across all 15 questions on Sex Determination and Genetic Disorders since 2017.
Difficulty
QUESTIONS- Easy7 · 47%
- Medium8 · 53%
- Hard0 · 0%
Format
SHARE- One-line MCQ · 10 Q67%
- Two statements · 1 Q7%
- Numerical · 1 Q7%
- Match the lists · 1 Q7%
- Other · 1 Q7%
- Figure-based · 1 Q7%
Skill tested
SHARE- Recall · 10 Q67%
- Concept · 2 Q13%
- Data or graph · 1 Q7%
- Figure reading · 1 Q7%
- Application · 1 Q7%
Repeats
New idea, or one asked before?
Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.
- Idea asked for the first time
- Idea asked in an earlier paper
Coverage of the topic
NEET has asked 0 of the 10 ideas in this topic. 0 have never been asked yet.
- Asked directly0 · 0%
- Touched inside another question10 · 100%
- Never asked0 · 0%
Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.
Drill down
Idea, year, question
Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.
- Repeated4 · 27%2
- 2026 · Q138Given below are two statements: Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes. Statement II: Turner's…
easyTwo statements
- 2023 · Q143Which of the following statements are correct about Klinefelter's Syndrome? A. This disorder was first described by Langdon Down (1866).…
mediumOther
- 2023 · Q180Broad palm with single palm crease is visible in a person suffering from-
easyOne-line MCQ
- 2019 · Q176What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile ?
easyOne-line MCQNew idea
- 2026 · Q138
- Repeated2 · 13%
- Repeated2 · 13%
- Repeated2 · 13%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.
Ideas
Every idea inside this topic
9 different ideas were tested; 4 came more than once.
- Down, Klinefelter and Turner Syndromes4×
count correct statements on a genetic disorder
One-line MCQ · 11% next - Mendelian Disorders and Their Loci2×
correct match on genetic disorders
Match the lists · 6% next - X-linked Recessive Inheritance2×
inheritance pattern of an x-linked trait
One-line MCQ · 6% next - XO, XY and ZW Sex Determination2×
identify group with sex determination type
One-line MCQ · 6% next - Pedigree Carrier Probability1×
numerical
Numerical · 6% next - Pedigree Symbols1×
identify pedigree symbol
Figure-based · 4% next - Autosomal Dominant Disorders1×
identify disorder by inheritance pattern
One-line MCQ · 4% next - Aneuploidy and Non-disjunction1×
identify disorder by cause
One-line MCQ · 4% next - Thalassaemia versus Sickle-cell Anaemia1×
true statement selection on genetic disorders
One-line MCQ · 4% next
Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas
Every question
Sex Determination and Genetic Disorders questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested.
NEET 20261 question
- Q138Given below are two statements: Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes. Statement II: Turner's…
Idea: Down, Klinefelter and Turner Syndromes
EasyTwo statements
NEET 20251 question
- Q152With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease…
Idea: Pedigree Carrier Probability
New ideaMediumNumerical · figure
NEET 20241 question
- Q182Match List I with List II List-I | List-II A. Down's syndrome | I. 11th chromosome B. α-Thalassaemia | II. 'X' chromosome C.…
Idea: Mendelian Disorders and Their Loci
MediumMatch the lists
NEET 20233 questions
- Q143Which of the following statements are correct about Klinefelter's Syndrome? A. This disorder was first described by Langdon Down (1866).…
Idea: Down, Klinefelter and Turner Syndromes
MediumOther - Q180Broad palm with single palm crease is visible in a person suffering from-
Idea: Down, Klinefelter and Turner Syndromes
EasyOne-line MCQ - Q185Which one of the following symbols represents mating between relatives in human pedigree analysis?
Idea: Pedigree Symbols
New ideaEasyFigure-based · figure
NEET 20223 questions
- Q106XO type of sex determination can be found in :
Idea: XO, XY and ZW Sex Determination
EasyOne-line MCQ - Q144Which of the following occurs due to the presence of autosome linked dominant trait ?
Idea: Autosomal Dominant Disorders
New ideaMediumOne-line MCQ - Q198If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ?
Idea: X-linked Recessive Inheritance
MediumOne-line MCQ
NEET 20201 question
- Q8Select the correct match.
Idea: Mendelian Disorders and Their Loci
New ideaMediumOne-line MCQ
NEET 20192 questions
- Q121Select the incorrect statement.
Idea: XO, XY and ZW Sex Determination
New ideaMediumOne-line MCQ - Q176What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile ?
Idea: Down, Klinefelter and Turner Syndromes
New ideaEasyOne-line MCQ
NEET 20181 question
- Q159A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
Idea: X-linked Recessive Inheritance
New ideaEasyOne-line MCQ
NEET 20172 questions
- Q128A disease caused by an autosomal primary non-disjunction is
Idea: Aneuploidy and Non-disjunction
EasyOne-line MCQ - Q179Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
Idea: Thalassaemia versus Sickle-cell Anaemia
MediumOne-line MCQ
Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.