CIE iGCSE Co-Ordinated Science B16.2 Cell division Exam Style Questions Paper 2
▶️ Answer/Explanation
Statement 1 refers to the production of gametes, which occurs by meiosis. Statement 2 states that the cells produced are genetically different, which is also a characteristic of meiosis (not mitosis, which produces genetically identical cells). Statement 3 describes the zygote dividing for growth, which occurs by mitosis. Therefore, process 1 and 2 are both meiosis, and process 3 is mitosis, which matches row A.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Meiosis halves the chromosome number of the parent cell, producing haploid cells (each with one set of chromosomes rather than two).
The original cell shown has 8 chromosomes (4 pairs), so the daughter cells produced by meiosis will have 4 chromosomes each.
Meiosis also involves crossing over and independent assortment, so the four cells produced are all genetically different from one another.
✅ Answer: (B)
The original cell shown has 8 chromosomes (4 pairs), so the daughter cells produced by meiosis will have 4 chromosomes each.
Meiosis also involves crossing over and independent assortment, so the four cells produced are all genetically different from one another.
✅ Answer: (B)
▶️ Answer/Explanation
Haploid means one full set of chromosomes, with no matching (homologous) pairs.
The diagram shows \(4\) different, unpaired chromosomes — no two are alike.
The number of chromosomes itself does not define “haploid”; the lack of pairing does.
✅ Answer: (D)
The diagram shows \(4\) different, unpaired chromosomes — no two are alike.
The number of chromosomes itself does not define “haploid”; the lack of pairing does.
✅ Answer: (D)
Question
If 2n is the diploid number of chromosomes in a nucleus, which diagram is correct for meiosis?
▶️Answer/Explanation
Ans: D
Question
Four processes which require the production of new cells are listed.
1 asexual reproduction
2 gamete production
3 growth
4 replacement of worn out cells
Which processes are brought about by mitosis?
A 1 and 2 only
B 1, 2 and 3
C 1, 3 and 4
D 2, 3 and 4
▶️Answer/Explanation
Answer: C
Explanation: Mitosis is a type of cell division that results in two daughter cells with the same number of chromosomes as the parent cell. It is involved in asexual reproduction, growth, and the replacement of worn-out cells. Gamete production, however, involves meiosis, which produces cells with half the number of chromosomes.