VARDAAN LEARNING INSTITUTE

Q1-10. Fill in the blanks:

1. The transmission of characters from parents to offspring is called __________.
2. The differences in the characters among the individuals of a species is called __________.
3. __________ is known as the Father of Genetics.
4. The functional unit of heredity is __________.
5. Alternative forms of the same gene are called __________.
6. The scientific name of the garden pea is __________.
7. The genetic constitution of an organism is called __________ (Genotype).
8. The observable characteristic of an organism is called __________ (Phenotype).
9. Humans have __________ pairs of chromosomes.
10. The sex chromosomes in females are __________.

Q11-20. Select correct option/word:

11. In a monohybrid cross, the phenotypic ratio in F2 generation is __________ (3:1 / 1:2:1).
12. In a monohybrid cross, the genotypic ratio in F2 generation is __________ (1:2:1 / 3:1).
13. The cross between two parents differing in two pairs of contrasting characters is called __________ (Dihybrid Cross).
14. The ratio 9:3:3:1 is obtained in __________ (Monohybrid / Dihybrid) cross.
15. Tallness (T) is a __________ (Dominant / Recessive) trait in pea plants.
16. Dwarfness (t) is a __________ (Dominant / Recessive) trait.
17. A plant with genotype Tt is __________ (Homozygous / Heterozygous).
18. A plant with genotype tt is __________ (Pure / Hybrid).
19. Wrinkled seeds are a __________ (Recessive / Dominant) character.
20. Violet flower color is __________ (Dominant / Recessive) over white.

Q21-30. State True or False:

21. Acquired traits are passed on to the next generation. __________ (False).
22. Recessive traits are expressed only in homozygous condition. __________
23. Sex of the child is determined by the mother. __________ (False).
24. XY chromosomes are found in males. __________
25. Evolution is a slow process. __________ (True, though Chapter 8 is Heredity only, this is general fact).
26. Variation decreases the chances of survival. __________ (False).
27. All 23 pairs of chromosomes in humans are perfectly homologous. __________ (False, XY is not).
28. A gamete contains only one allele of a gene. __________
29. DNA is the information source for making proteins. __________
30. Mendel selected the pea plant because it was bisexual. __________

Q31-40. Answer in one word:

31. Name the carrier of genes. __________ (Chromosomes/DNA).
32. What do we call the offspring of the P generation? __________ (F1 Generation).
33. Name the plant on which Mendel performed his experiments. __________ (Garden Pea).
34. Which chromosome is responsible for maleness in humans? __________ (Y chromosome).
35. Give the term for "having two different alleles for a trait". __________ (Heterozygous).
36. Who proposed the laws of inheritance? __________ (Mendel).
37. How many autosomes are present in human sperm? __________ (22).
38. What is the percentage chance of having a boy? __________ (50%).
39. Name the recessive trait for seed shape. __________ (Wrinkled).
40. Name the dominant trait for pod color. __________ (Green).

Q41-50. Match the Genotype with Description:

41. TT - __________ (Homozygous Tall)
42. Tt - __________ (Heterozygous Tall)
43. tt - __________ (Homozygous Dwarf)
44. RRYY - __________ (Round Yellow)
45. rryy - __________ (Wrinkled Green)
46. RrYy - __________ (Round Yellow Hybrid)
47. XX - __________ (Female)
48. XY - __________ (Male)
49. 22 pairs - __________ (Autosomes)
50. 1 pair - __________ (Sex Chromosomes)