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Level 0 Answer Key: Heredity and Evolution

Class: 10 Science Type: Basics Key Verified Answers

Section A: Heredity Basics (Q1-15)

1. Heredity

2. Variation

3. Gene

4. Chromosome

5. DNA

6. Gregor Mendel

7. Pea plant (Pisum sativum)

8. Dominant

9. Recessive

10. Allele

11. Genotype

12. Phenotype

13. Homozygous

14. Heterozygous

15. 3:1

Section B: Sex Determination (Q16-25)

16. 46 (23 pairs)

17. 44 autosomes

18. 2 sex chromosomes

19. XX (Female)

20. XY (Male)

21. Father (sperm: X or Y)

22. 50% (1:1)

23. X chromosome

24. Y chromosome

25. Gamete

Section C: Evolution (Q26-40)

26. Charles Darwin

27. Natural Selection

28. Survival of the Fittest

29. Fossil

30. Homologous organs

31. Analogous organs

32. Vestigial organs

33. Speciation

34. Genetic drift

35. Gene flow

36. Archaeopteryx

37. Human evolution

38. Africa

39. Homo sapiens

40. Mutation

Section D: True/False (Q41-50)

41. True

42. False (Gregor Mendel)

43. True

44. False (Father)

45. True

46. False (common ancestor)

47. True

48. False (variations)

49. True

50. True