Chromosome Duplication in Biology: Definition and Examples

📚 Chromosome Duplication: Quick Study Guide

• 🧬 Chromosome duplication is a process where a chromosome is copied, resulting in two identical copies called sister chromatids.
• 🔬 This duplication is a crucial part of cell division (mitosis and meiosis), ensuring each daughter cell receives the correct number of chromosomes.
• 📅 The process occurs during the S phase (synthesis phase) of the cell cycle.
• 🧪 Errors in chromosome duplication can lead to mutations, genetic disorders, or cancer.
• 🔢 The number of chromosomes after duplication is temporarily doubled but returns to normal after cell division.

Practice Quiz

1. What is the primary result of chromosome duplication?

   1. An exact copy of the original chromosome
   2. A slightly altered version of the chromosome
   3. The destruction of the original chromosome
   4. The creation of a completely new chromosome

2. During which phase of the cell cycle does chromosome duplication occur?

   1. G1 phase
   2. S phase
   3. G2 phase
   4. M phase

3. What are the identical copies of chromosomes formed after duplication called?

   1. Homologous chromosomes
   2. Sister chromatids
   3. Daughter chromosomes
   4. Analogous chromosomes

4. What is the main purpose of chromosome duplication in cell division?

   1. To increase the size of the cell
   2. To ensure each daughter cell receives the correct number of chromosomes
   3. To introduce mutations into the cell
   4. To speed up the process of cell division

5. Which of the following can result from errors in chromosome duplication?

   1. Increased cell size
   2. Genetic disorders
   3. Enhanced cell function
   4. Decreased mutation rate

6. If a cell has 46 chromosomes before duplication, how many chromatids will it have after duplication but before cell division?

   1. 23
   2. 46
   3. 92
   4. 138

7. In what cellular process is chromosome duplication essential?

   1. Apoptosis
   2. Photosynthesis
   3. Cell respiration
   4. Mitosis and Meiosis