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O-LevelBiologyGenetics & Variation5090/21 · May/June 2014 · Q710 Marks

Compare the processes of mitosis and meiosis.

  1. (a)Compare the processes of mitosis and meiosis.[4]
  2. (b)Use your knowledge of how sex is inherited to explain which parent determines the sex of a child.[6]

Mark scheme

Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.

  1. [4] Mitosis: 2 daughter cells / Meiosis: 4 daughter cells
  2. Mitosis: diploid / Meiosis: haploid
  3. Mitosis: chromosome number maintained / Meiosis: chromosome number halved
  4. Mitosis: occurs in all organs/body cells / Meiosis: occurs in gamete producing organs/named
  5. Mitosis: produces body cells/used in growth / Meiosis: produces gametes/named
  6. Mitosis: ref. asexual reproduction / Meiosis: ref. sexual reproduction
  7. Mitosis: no genetic variation in offspring AW / Meiosis: genetic variation in offspring AW
  8. [1] Father;
  9. [5] Max 5 from the following:
  10. father is XY/contains Y chromosomes ;
  11. mother is XX/does not contain Y chromosomes ;
  12. father produces sperm with either X or Y (chromosomes) ;
  13. mother produces eggs only with X (chromosomes) ;
  14. sex depends on which sperm fertilises the egg ;
  15. 1:1 male: female in offspring/AW;

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About this question

Topic
Genetics & Variation, O-Level Biology (syllabus 5090). Structured question, 10 marks.
Source
O-Level Biology, May/June 2014 Paper 2 Variant 1, question 7.

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