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: Heredity →

26. Different varieties of the same gene are calledAsked in UPSC NDA 2 2021
27. Who is known as father of Genetics ?Asked in UKPSC CS Prelims 2021
28. One way of incorporating desired characters into crop varieties is hybridization. In this process, there is crossing between genetically dissimilar plants. Which one of the following crossings will not refer to hybridization?Asked in UPSC CAPF 2022
29. In monohybrid cross of Mendel, when a pure tall plant was crossed with a dwarf plant, all the F₁ progeny were tall, because of :Asked in WBPSC CS Prelims 2015
30. “Particulate theory of inheritance” was proposed byAsked in WBPSC CS Prelims 2017
31. Genes which code for a pair of contrasting traits are known asAsked in Clerk GR II Comb. Comp. Exam 2013
32. Given below are two statements, one is labelled as Assertion (A) and other as Reason (R). Assertion (A): Genetics is study of pattern of inheritance and variation of characters from parents to offspring. Reason (R): Inheritance is the process of transfer of characters from one to the next generation. Select the correct answer using the code given below : Code :Asked in ASSISTANT PROSECUTION OFFICER (PRELIM.) EXAM. 2022
33. According to Mendel's law of independent assortment, genesAsked in JUNIOR laboratory assistant 2025
34. In pea, a pure tall plant (TT) is crossed with a short plant (tt). What will be the ratio of pure tall plants to short plants in the F₂ generation ?Asked in UPSC CDS 2 2021
35. Phenotypic ratio of Mendelian Dihybrid cross isAsked in WBPSC CS Prelims 2015
36. Mendel's law of independent assortment is based upon observations ofAsked in Clerk GR II Comb. Comp. Exam 2013
37. एक जोड़े (कपल्स) को संदेह है ͩक उनके नवजात ͧशशु की हॉǔस्पटल में अदला-बदली हुई है। इस ͪववाद को सुलझाने के ͧलए रक्त वगर्गीकरण चाहा गया है। पुरुष का रक्त समूह A है तथा औरत का रक्त समूह B है। उनके जैͪवक ͧशशु का रक्त समूह हो सकता है : i. या तो A या B ii. A या B या O या AB iii. A या B या AB iv. AB सही ͪवकल्प चुǓनए :Asked in HAS Prelims 2021
38. A couple suspects a mix up of their new born baby in the hospital. Blood typing is sought to resolve the dispute. The man has blood group A and the woman has blood group B. Their biological child can have blood group i. Either A or B ii. A or B or O iii. A or B or AB iv. only AB Choose the correct option :Asked in HAS Prelims 2021
39. Father and mother having A and B blood group respectivelyAsked in UPSC CAPF 2011
40. A man of blood group-A marries a woman of blood group-AB, which type of progeny would indicate that man is heterozygous?Asked in WBCS Main Paper 4 2019
41. Who discovered ABO system?Asked in ECONOMIC INVESTIGATOR(EO) 2019
42. Genes are made-up ofAsked in CGPSC Prelims Exam 2012
43. The characteristics features of genetic code are i. It is always universal ii. It is triplet of nucleotides bases corresponding to 20 amino acids iii. It is non-overlapping, non-ambiguous and commaless iv. It has start and stop codon Which of the statements given above are true ?Asked in MPPSC CS Prelims 2020
44. Change in the base sequence within a gene is called :Asked in OPSC CS Prelims 2020 · UPPCS Prelims 2020
45. Who had proposed for the first time the double helix model of DNA ?Asked in UPPCS Prelims 2012
46. Change in the base sequence within the gene is calledAsked in UPPCS Prelims 2016
47. James D. Watson and Francis Crick are associated with the discovery of:Asked in UPPSC Upper Mains 2012
48. Which of the following features of DNA makes in uniquely suited to store and transmit genetic information from generation to generation?Asked in UPPCS Prelims 2001
49. The short form of deoxyribonucleic acid isAsked in District Library and Information Officer(DLIO) 2018
50. The Pentose sugar present in DNA isAsked in Co operative Supervisor & Environment Supervisor (Group C) Exam 2023