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27. Write the basic characterstic of cell design in which cells differ from each other. 29. Which method is extensively used to define evolutionary relationship? 2 mark questions :- 30. Name any four methods used for studying human evolution. 31. Distinguish between dominant and recessive traits. 32. Define a chromosome. What are the total number of chromosomes in sperm cells of human males? 33. Define acquired traits. Give examples.34. Describe the two ways of determining the age of fossils. 35. XY and XX are sex chromosomes. Write the contribution of father and mother in each of these sets. 37. Under what molecular conditions any trait is considered as recessive? 38. Evolution should not be equated with progress. Give reasons. 39. How can we say that bacteria has superior body design then a fish? 3 mark questions :- 40. The reproductive cell undergo reductional division. Write the number of different typesof gametes produced from one XX and one XY. Also find the ratio of X to Y? 41. Describe how the number of chromosomes is conserved in progenies 42. Explain how genes control traits? 43. Enlist any three contrasting visible characteristics studied by Mendel in pea plant. 44. In Mendel's experiment, F1 progeny had no halfway of intermediate features. Explain this statement by giving suitable example.45. Explain possible way of evolution of eye. 46. Give one example each of genetic drift and gene flow. 47. Rahul and Parul were having a discussion on the superiority of complex over simplebody designs. You are asked to participate in the discussion and present your views. 48. Prachi and Sumit were studying the homologous and analogous organs with the help ofwing of a butterfly, wings of a bat, forelimbs of horse and humans. You are asked to helpthem providing reasons for your response. 49. What is the evolutionary relationship between human beings and chimpanzee? 50. Explain speciation. 51. Trace the path of Y chromosomes received by a progeny since gamete formation in theparent.
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