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MCQ Questions for Class 12 Biology Set 3

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1. Gunetical identification of male human is:




2. Rh+ individual gene may be:




3. Cause of chromosomal mutation:




4. Mendal was born in:




5. Two genes very close on a chromosome will show:




6. First geneticist/father of genetics was:




7. An lndividual with into identical alleles is:




8. Mendal’s law can be applicable only when:




9. A true hybrid condition is:




10. The allele which is unable to express its effect in the presence of another is called :




11. Most of the mutations are:




12. Smallest segment of genetic material affected by mutation is :




13. Genes located on V-chroinosome are:




14. A strong mutagen is:




15. A point mutation is:




16. Mendel’s second law is of the law of:




17. An organism with two unlike genes of a trait is called :




18. Mendel’s laws were discovered by:




19. Mendel’s formulated the law of purity of gametes on the basis of:




20. tt mates with Tt. What will be characteristic of offspring:




21. Failure of segregation of chromatids during cell division Cycle result in the gain or loss of a cromosome (s) is called :




22. Exception of Mendel’s law is:




23. Haemophilia is a:




24. Down’s syndrome is a:




25. Mendel worked on :




26. A gamete contains which of the following :




27. Name the scientist who discovered the law of Heredity :




28. Punnett square was developed by:




29. Who introduced Chromosomal Theory of Inheritance?




30. The plant Mendel used to study inheritance of two genes is:




31. Mendel published his work on inheritance of character in?




32. Female heterogamety is :




33. Represser Lac-Operon protein attached to:




34. Following is important in ĂŹranscription:




35. Anticodon found in:




36. In DNA helix:




37. During splicing axon attached and inducer enzyme for reaction:




38. During DNA synthesis formed segment is:




39. In a give DNA segment ATC ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by the DNA segment will result in :




40. DNA fragments are joined in a correct sequence by :




41. The ratio constant for a species is :




42. DNA repairing is done by:




43. A ribotide is made up of:




44. the enzyme involved in transcription is:




45. Antiparallel strands of a DNA molecule means that:




46. Which one is mainly transcribed:




47. Amino acid sequence, in protein synthesis is decided by the sequence of?




48. DNA multiplication is also called:




49. During Protein synthesis, atone point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt:




50. One turn of the helix in p-from DNA is approximately: