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2 marksCell Division and Genetics

CSEC Human and Social Biology · May/June 2014 · Paper 2 · Question 4(a)

Cell division mechanisms (mitosis and meiosis), chromosomal disorders, and the human menstrual cycle.

Complete the sentences: Meiosis is a type of cell division in which the chromosome number is [blank]. At the end of meiosis in humans, each daughter cell contains [blank] chromosomes.

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Other parts of this question

  1. 4(b)(i)Name the type of cell in which meiosis occurs.[1 mark]
  2. 4(b)(ii)State TWO differences between mitosis and meiosis.[2 marks]
  3. 4(c)Name a genetic disease that results if the zygote receives an extra chromosome.[1 mark]
  4. 4(d)(i)During which period does menstruation occur according to Figure 6?[1 mark]
  5. 4(d)(ii)What occurs within the ovary as the wall of the uterus starts to thicken, and during which days of the cycle does this occur?[2 marks]
  6. 4(d)(iii)Between days 14 and 28, what is the pattern seen with the ovarian hormonal levels if pregnancy does NOT occur?[4 marks]
  7. 4(d)(iv)a)Which pituitary hormone controls ovulation?[1 mark]
  8. 4(d)(iv)b)On which day does ovulation occur?[1 mark]

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