Biology questions with answers

2,759 multiple-choice questions. Open any question for its answer and explanation.

Questions asked in State PSC and UPSC prelims, by topic. Each topic also has notes to read.

Read the notes: Genetic Disorders →

1. Albinism is caused due to the deficiency of a/ an:Asked in OPSC CS Prelims 2020
2. Which of the following professional (s) are more likely to run the risk of a permanent change in their cell’s DNA? I. Researchers using carbon-14 isotope II. X-ray technician III. Coal miner IV. Dyer and Painter Select the correct answer by using the codes given below:Asked in UPPCS Prelims 1996
3. Mutagen that is not alkylating agent isAsked in Agri. Officer 2020
4. Which one of the following examples of genetic-disorder or disease is due to the numerical abnormalities in the sex chromosome ?Asked in UPSC Geoscientist 2024
5. In humans trisomy of chromosome number 21 is responsible forAsked in RPSC RAS Prelims 2018
6. Trisomy 21 is known as -Asked in RPSC RAS Prelims 2021
7. Barr body is absent in somatic cell ofAsked in WBPSC CS Prelims 2017
8. In human beings, disorder caused due to trisomy of 21st chromosome is:Asked in MPPSC CS Prelims 2024
9. Cause of 'Down's syndrome' in humans isAsked in Junior Accountant and TRA 2013
10. Down syndrome is also known asAsked in Civil Engg GA 24 2023 CO 1505 2024
11. Ques #: 97 the birth defect where there is incomplete closing of the back bone and membrane around spinal chord is known asAsked in Sr. Teacher Gr II (Spl. Edu.) 2015
12. Which of the following groups of diseases includes genetic diseases?Asked in HAS Prelims 2021
13. Which of the following group of diseases comprises genetic diseases?Asked in HAS Prelims 2021
14. Genetic disorders are :Asked in OPSC CS Prelims 2018
15. Paa is a 2009 Indian comedy-drama film directed by R. Balakrishnan in which Amitabh Bachchan is shown to suffer with a rare genetic disease of childhood characterized by dramatic, premature ageing. What is this type of disorder called ?Asked in PPSC CS Prelims 2013
16. Which one of the following is not a genetic disease?Asked in UPPCS Prelims 2017
17. Which of the following is/are correct regarding DNA fingerprinting?Asked in Assistant Auditor (Direct) 2021
18. Which of the following is known as Royal Disease ?Asked in GPSC Prelims CSP 2 2017
19. Which of the following statements is/are correct ? 1. Haemophilia is a genetic disorder which leads to decrease in the white blood cells 2. The sex of new born baby is determined by the chromosomes inherited from the mother 3. Haemophilia is low in women due to a dominant gene found on Y chromosomeAsked in GPSC Prelims CSP 2 2019
20. What happens in human Thalassemias? reduce $\alpha$ - globin synthesis reduce $\beta$ - globin synthesis enhance $\alpha$ and $\beta$ - globin synthesisAsked in TNPSC CS Prelims 2019
21. Thalassemia is a hereditary disease which affectsAsked in UKPSC CS Prelims 2016
22. The X-chromosome linked colour blindness affects the ability to detect the difference between which of the following lights ?Asked in UPSC CISF AC EXE 2018
23. Which of the following diseases is autosomal?Asked in WBPSC CS Prelims 2023
24. The heritable disease isAsked in UPPSC Upper Mains 2007
25. Haemophilia is a genetic disorder which leads toAsked in UPPCS Prelims 1998