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Chapter 8: Problem 1

How many chromatids does a duplicated chromosome have?

Short Answer

Expert verified
A duplicated chromosome has two chromatids.

Step by step solution

01

Understanding Chromosomes

First, we need to understand the basic unit of chromosomes. A chromosome is a single piece of coiled DNA containing many genes. Chromosomes are visible during cell division and occur in pairs in diploid organisms.
02

Definition of a Duplicated Chromosome

A duplicated chromosome refers to a chromosome that has been copied before cell division. This means the DNA has been replicated so that each chromosome consists of two identical copies prior to division.
03

Structure of a Duplicated Chromosome

Each duplicated chromosome consists of two sister chromatids. These chromatids are the replicated forms of the original chromosome and are joined together at a region called the centromere.
04

Identifying the Number of Chromatids

Since a duplicated chromosome is made up of two sister chromatids, the number of chromatids in a duplicated chromosome is 2.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Chromosome
Imagine a book filled with many chapters, each chapter containing crucial information. In biology, this book is akin to a chromosome. Chromosomes are structures within cells that hold the genetic instructions vital for the functioning and reproduction of living organisms. They are made of long DNA molecules coiled tightly together.
  • DNA holds genes, the blueprints for proteins that help with every cell function.
  • Chromosomes ensure DNA is distributed accurately during cell division.
  • In humans, chromosomes come in homologous pairs, meaning one chromosome from each parent.
Understanding chromosomes is essential for comprehending genetic inheritance and variation.
Cell Division
Cell division is a fundamental process for life. It allows organisms to grow, repair damaged tissue, and reproduce. There are two main types of cell division: mitosis and meiosis.
  • Mitosis results in two identical daughter cells, each with the same number of chromosomes as the parent cell. It is crucial for growth and repair.
  • Meiosis occurs in germ cells, leading to four genetically diverse daughter cells, each with half the number of chromosomes of the parent cell. It is vital for sexual reproduction.
During cell division, chromosomes first duplicate. This ensures that each resulting cell receives a complete set of genetic instructions.
DNA Replication
DNA replication is like a meticulous copy-making process of a complex novel. Before a cell divides, it needs to replicate its DNA to ensure each new cell has the same genetic material.
  • This process happens during the S-phase of the cell cycle.
  • Enzymes play a key role in unwinding the DNA double helix.
  • Each original strand serves as a template for a new complementary strand.
The result is two identical DNA molecules, each with one old and one new strand, also known as semi-conservative replication.
Note: Accurate DNA replication is critical for maintaining genetic stability across cell generations.

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Most popular questions from this chapter

Interphase is the part of the cell cycle when __________. a. a cell ceases to function b. a cell forms its spindle apparatus c. a cell grows and duplicates its DNA d. mitosis proceeds

Meiosis and cytoplasmic division function in __________. a. asexual reproduction of single-celled eukaryotes b. growth and tissue repair c. sexual reproduction d. both a and b

A cell with two of each type of chromosome has \(a(n)\) __________ chromosome number. a. diploid b. haploid c. tetraploid d. abnormal

Mitosis and cytoplasmic division function in __________. a. asexual reproduction of single-celled eukaryotes b. growth and tissue repair in multicelled species c. gamete formation in prokaryotes d. both a and b

Only __________ is not a stage of mitosis. a. prophase b. interphase c. metaphase d. anaphase
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