Class 12 Biology Chapter 21 – Genetics MCQs | FBISE | Grade 12 Biology
Description: Practice 50 exam-oriented MCQs from Class 12 Biology Chapter 21 – Genetics, covering Mendelian inheritance, alleles, genetic crosses, linkage, recombination, sex-linked inheritance, mutations, and genetic variation.
1. Genetics is the study of
2. The transmission of characteristics from parents to offspring is called
3. The basic unit of heredity is the
4. Alternative forms of the same gene are called
5. An individual with two identical alleles for a gene is
6. An individual with two different alleles for a gene is
7. The genetic makeup of an organism is its
8. The observable characteristics of an organism are its
9. Gregor Mendel performed his classic inheritance experiments mainly using
10. Mendel selected pea plants partly because they have
11. A cross involving one pair of contrasting traits is a
12. A cross involving two pairs of contrasting traits is a
13. The principle stating that allele pairs separate during gamete formation is the law of
14. The principle stating that different gene pairs can assort independently is the law of
15. In a heterozygous individual, the allele expressed in the phenotype under complete dominance is the
16. A recessive trait is expressed when the genotype is
17. The genotype Aa is
18. The genotype AA is
19. The genotype aa is
20. A test cross is usually performed between an individual of unknown genotype and a
21. The typical phenotypic ratio in an F2 monohybrid cross under complete dominance is
22. The typical genotypic ratio in an F2 monohybrid cross is
23. The typical phenotypic ratio in a Mendelian dihybrid F2 cross is
24. A cross between an organism and one of its parents is called a
25. A cross between two heterozygous individuals Aa × Aa can produce
26. Incomplete dominance occurs when the heterozygote has
27. Codominance occurs when
28. The ABO blood group system is an example involving
29. In the ABO system, the IA and IB alleles are
30. The O blood group genotype is
31. A trait controlled by many genes is described as
32. Human skin colour is commonly used as an example of
33. Genes located on the same chromosome are said to be
34. Linkage tends to cause genes to
35. Crossing over can produce
36. The frequency of recombination between two linked genes is related to their
37. Genes farther apart on the same chromosome generally show
38. Sex-linked genes are located on
39. In humans, the X chromosome is generally larger than the
40. X-linked recessive traits are often more common in males because males
41. A male inherits his X chromosome from his
42. A male inherits his Y chromosome from his
43. A mutation is a
44. A mutation involving a single nucleotide pair is commonly called a
45. Insertion or deletion of nucleotides can cause a
46. A mutation that changes a codon into a stop codon is a
47. A mutation that changes a codon so that a different amino acid is specified is a
48. A mutation that does not change the amino acid encoded may be
49. Genetic variation in populations can result from mutation, recombination and
50. The study of inheritance patterns helps explain
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Class 12 Biology Chapters
- Chapter 16 – Reproduction MCQs
- Chapter 17 – Support and Movement MCQs
- Chapter 18 – Coordination and Control MCQs
- Chapter 19 – Chromosomes and DNA MCQs
- Chapter 20 – Cell Cycle MCQs
- Chapter 21 – Genetics MCQs
- Chapter 22 – Evolution MCQs
- Chapter 23 – Ecosystem MCQs
- Chapter 24 – Man and His Environment MCQs
- Chapter 25 – Biotechnology MCQs
- Chapter 26 – Pharmacology MCQs
Syllabus and SLO Alignment
Syllabus: This chapter covers Mendelian inheritance, alleles, genetic crosses, linkage, recombination, sex-linked inheritance, mutations, and genetic variation as prescribed for FBISE Grade 12 Biology.
SLO Alignment: These MCQs are designed to assess the relevant FBISE Student Learning Outcomes (SLOs) through knowledge, understanding, and application of the concepts covered in this chapter.