Worksheet Chapter 6: Cell Division

1. State two biological importances of mitosis in living organisms.

2. Explain how cancer develops from an abnormality in the cell cycle.

3. Which phase of Interphase is dedicated to DNA synthesis and chromosome duplication?

4. A tissue sample from an onion root tip shows cells at various stages of mitosis: - Cell A: Chromosomes are aligned individually along the equatorial plane. - Cell B: Sister chromatids are separating and moving toward opposite poles. - Cell C: Chromatin is condensing and the nuclear membrane is disintegrating. Identify the mitotic stages of Cells A, B, and C.

5. Compare and contrast Mitosis and Meiosis.

6. True or False: Plant cells form a cleavage furrow during cytokinesis because they lack a rigid cell wall.

7. True or False: Mitosis produces four genetically non-identical haploid daughter cells.

8. Define the term 'nondisjunction' in cell division.

9. Fill in the blank: The physical point of contact where non-sister chromatids exchange genetic material during crossing over is called a ________.

10. Genetic variation is essential for the survival of a species. (a) Describe two mechanisms during meiosis that generate genetic variation in offspring. (b) Explain why gametes must be haploid ($n$) rather than diploid ($2n$).