1. The similar characteristics passing from parents to offspring are collectively called:
Answer: B. heredity
Biology Class 11 Unit 12: Inheritance MCQs
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2. The differences among offspring and between offspring and parents are called:
Answer: B. variations
3. The science dealing with heredity and variation is:
Answer: B. genetics
4. A gene is best defined as:
Answer: B. a sequence of nucleotides in DNA that codes for a polypeptide
5. The basic unit of heredity is the:
Answer: B. gene
6. Three bases (codon) code for one:
Answer: B. amino acid
7. The strand of a gene that determines the type of protein is called the:
Answer: B. template strand
8. Genetics originated in the year 1900 with the work of:
Answer: B. Gregor Johann Mendel
9. Mendel worked on:
Answer: B. pea plant
10. Mendel is called the father of:
Answer: C. genetics
11. When both alleles of a gene pair are the same, the organism is:
Answer: B. homozygous
12. An organism with two different alleles for a gene pair is:
Answer: B. heterozygous
13. The F1 of a cross between RR and rr is:
Answer: C. Rr
14. The phenotypic ratio in F2 of a monohybrid cross is:
Answer: B. 3:1
15. The genotypic ratio in F2 of a monohybrid cross is:
Answer: B. 1:2:1
16. The law of segregation states that:
Answer: B. the two alleles for a trait separate at meiosis so each gamete receives only one
17. A cross between two individuals differing in two traits is a:
Answer: B. dihybrid cross
18. The phenotypic ratio in F2 of a dihybrid cross is:
Answer: C. 9:3:3:1
19. In a dihybrid cross between RRYY and rryy the F1 is:
Answer: D. RrYy, all round yellow
20. The F1 dihybrid RrYy produces how many types of gametes?
Answer: C. Four
21. The number of boxes in the Punnett square of a dihybrid F2 is:
Answer: C. 16
22. Round green and wrinkled yellow are called:
Answer: B. recombinant types
23. The law of independent assortment states that:
Answer: B. each pair of alleles assorts independently of other pairs during gamete formation
24. Independent assortment of genes is due to:
Answer: B. random orientation of homologous chromosomes at metaphase I
25. In humans, the number of possible combinations of chromosomes in gametes is about:
Answer: C. 2 raised to 23, about eight million
26. The Punnett square was devised by:
Answer: B. R. C. Punnett
27. The limitation of independent assortment is that genes on the same chromosome:
Answer: B. do not assort independently
28. A source of variation other than independent assortment is:
Answer: B. mutation and crossing over
29. Which does NOT promote genetic variation?
Answer: D. Mitotic division
30. The probability of an event is:
Answer: B. number of favourable cases divided by the total number of possible cases
31. The probability of obtaining a head on tossing a coin is:
Answer: B. 1/2
32. The probability of dominant phenotype in F2 of monohybrid cross is:
Answer: C. 3/4
33. The probability of recessive phenotype in F2 is:
Answer: A. 1/4
34. The combined probability of two independent events is calculated by the:
Answer: B. product rule
35. The probability of round yellow phenotype in F2 of a dihybrid cross is:
Answer: C. 9/16
36. If both parents are Rr heterozygous, the probability of homozygous recessive offspring is:
Answer: B. 1/4
37. Exceptions to Mendel's laws are called:
Answer: B. non-Mendelian inheritance
38. Which is an exception to Mendelian inheritance?
Answer: B. Incomplete dominance, co-dominance and multiple alleles
39. In incomplete dominance the heterozygote shows:
Answer: C. an intermediate phenotype
40. Incomplete dominance was first reported by Carl Correns in:
Answer: B. four o'clock plant (Mirabilis jalapa)
41. When red and white four o'clock plants are crossed, F1 plants have:
Answer: C. pink flowers
42. The F2 ratio in incomplete dominance of four o'clock is:
Answer: B. 1:2:1 (red:pink:white)
43. In co-dominance both alleles:
Answer: B. express independently in the heterozygote
44. An example of co-dominance in humans is:
Answer: C. MN blood group and AB blood group
45. A person with LMLN genotype has:
Answer: C. both M and N molecules on the red blood cells
46. If a man of M blood group marries a woman of N blood group, all their children will have:
Answer: D. MN blood group
47. Alleles are:
Answer: B. alternative forms of a gene at the same locus
48. A gene having more than two allelic forms shows:
Answer: C. multiple alleles
49. Multiple alleles are produced by:
Answer: B. gene mutation
50. A diploid individual can carry at most how many alleles of a gene?
Answer: B. Two
About Biology Class 11 Unit 12 MCQs (Federal Board)
These 228 Biology MCQs cover Class 11 Unit 12: Inheritance of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.