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ICSE Prelims Select : Select (St. Patricks Junior College, Agra)

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Neelam Agarwal
St. Patrick's Junior College, Wazirpura, Agra

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Test - Cell division and genetics Name the following : 1. A certain structure that initiates cell division- centrosome 2. A cross between one pair of contrasting character. Monohybrid cross. 3. A gene that can express only when in a similar pair- recessive gene 4. A hereditary disease in which blood does not clot. Haemophilia. 5. A membrane that disappear during late prophase - nuclear membrane 6. A region of plant body where cell division occurs very actively.- Growing points. 7. A specific part of chromosomes that determines heredity characteristics- genes 8. Acts as a bearer of heredity units.- Chromosomes / Chromatin network 9. Alternate forms of same gene alleles 10. Autosomes chromosomes does not take part in sex determination 11. Cell divides into two daughter cells- Cell division 12. Cell division in repairing of worn out tissues- mitosis 13. Chromatids form network of chromatic fibres- telophase 14. Chromatin fibre is made up of DNA and Histone 15. Chromosomes are attached to the spindle fibres by ........ Centomere 16. Condensation of chromatin into typical chromosom - prophase 17. Development of spindle- prophase 18. Division of cytoplasm- Cytokinesis 19. Division of nuclear- .Karyokinesis 20. DNA adenine is paired with .... Thymine 21. DNA guanine is paired with ..... Cytosine 22. DNA replicates in the ................ of the cell cycle- Interphase 23. DNA strands are made up of and four types of . Pentose sugar phosphate , nitrogenous bases 24. Duplication of dna occurs in the s phase 25. Each centriole is surrounded by radiating rays called aster 26. Exchange of genetic material between the arms of homologous chromosomes- Crossing over 27. Father of genetics- G. J. Mendel 28. Function of centomere- help in the movement of chromosomes 29. Function of DNA- it controls all the biosynthetic process of the cell. 30. Growth of shoot. (b) Formation of pollen grains. (c) Repair of worn out tissues.- (a) Mitosis, (b) Meiosis, (c) Mitosis. 31. How many genes in human- 25000 32. How many sex chromosomes are present in male and female -Two identical (XX) in female two different (XY) in males 33. How many types of variation of ear lobes are found in human population- free ear lobes, attached ear lobe 34. It do not participate in sex determination- autosomes 35. Monohybrid ration- 3:1 36. Nuclear membrane disappears- prophase 37. Nucleotides are specific segments of DNA 38. Pairing of homologous chromosomes- Synapse 39. Phase of cell cycle during which the cell grows- G1 phase 40. Phase of cell cycle in which DNA replication takes place- s phase 41. Physical expression of a trait- phenotype 42. Process by which gametes are formed gametogenesis 43. Reappearance of nuclear membrane- telophase 44. Recognizable feature of an organism- trait. 45. Sate the significance of mitosis. 46. Second law of mendel- law of segregation 47. Separation of sister chromatids- anaphase 48. Shortest phase of mitosis- anaphase 49. Small difference between among individual - variation 50. State the types of chromosomes according to the position of centromere. 51. Sudden change in one or more genes- mutation 52. The allele which expresses itself on the other. (x) Dominant. 53. The appearance of a character which is due to the presence of an allele- sex linked inheritance 54. The branch of science dealing with heredity. (iii) Genetics. 55. The centriole divide and move towards the pole- prophase 56. The chemical substance constituting genes. (viii) DNA. 57. The chromosome number becomes halves during meiosis 58. The chromosome number in sperm an egg are 23 59. The combination of genes in an organism- genotype 60. The condition of both the alleles being identical. (vii) Homozygous. 61. The cross between F1 hybrid and recessive parent- test cross 62. The distance between two base pairs of DNA is .... 3.4 A0 63. The genetic make up of an organism. (xi) Genotype. 64. The kind of cell division normally seen at the tip of root and shoot system Mitosis. 65. The kind of division takes place in the reproductive tissues. Meiosis. 66. The largest phase of a normal cell cycle. Prophase. 67. The law which explaine the dihybrid ratio- law of independent assortment 68. The longest phase of cell cycle- interphase 69. The nucleolus and nuclear membrane disappear- Later prophase 70. The nucleolus and nuclear membrane reappear- Telophase 71. The number of pairs of autosomes in human being. (vi) 22 pairs. 72. The phase of meiosis where homologous chromosomes are separated- anaphase-1 73. The point at which the duplicated chromosomes are joined.- Centromere. 74. The points where crossing over occurs. Chiasmata. 75. The process of meiosis takes place to produce sperms and ova 76. The scientific name of the garden pea which is used by mendel for his experiment- pisum sativum 77. The sex chromosome of male. (ix) X and Y. 78. The shortest phase of cell cycle- anaphase 79. The sister chromatids undergo mutual repulsion and split longitudinally into two halves- anaphase 80. The spindle fibres are made up of microtubules 81. The stage when chromosomes arrange at the equator. Metaphase. 82. The structure which help in cell division in animal cell- centosome 83. The structure which joins the two chromatids---- centromere 84. The suppressed allele of a gene- recessive 85. The two kinds of cell division found in living organisms. Mitosis, Meiosis. 86. The type of cell division that occurs during : 87. The type of gene which in the presence of a contrasting allele is not expressed. (ii) Recessive genes. 88. The unit of heredity. (v) Genes 89. They appear between two daughter centrioles- spindle fibres 90. They are made up od different type of alleles- hybrid strain 91. They are made up of same type of alleles- pure strain 92. Transmission of traits from one generation to the following generation of living things- heredity 93. Two animals which have nineteen pairs of chromosomes. (i) Cat and sheep. 94. Two animals which have nineteen pairs of chromosomes.- Lion, Tiger. 95. Two arms of a chromosome - Chromatids 96. Two sex linked inherited diseases. (xiii) Haemophilia & Colour Blindness 97. Two strands of DNA helix are held together by hydrogen bond 98. Type of cell division in the formation of pollen grains- meiosis 99. What happens during metaphase of mitosis ? 100. What is the importance of meiosis ? 101. Why mitosis is referred to as reduction division ?

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