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A giant chormosome with a number of chro...

A giant chormosome with a number of chromonemata is

A

Lampbrush chromosome

B

Heterochromosome

C

supernumerary chromosome

D

Polytene chromosome

Text Solution

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The correct Answer is:
To solve the question "A giant chromosome with a number of chromonemata is:", we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Chromonemata**: - Chromonemata are the coiled and entangled portions of DNA within a chromosome. They are the structural components that contain genes. 2. **Identifying the Types of Chromosomes**: - We need to analyze the options provided: - **Option 1: Lambrusch chromosome** - This is not commonly associated with a large number of chromonemata. - **Option 2: Heterochromosome** - These are chromosomes that are genetically different from the standard chromosomes and do not typically refer to giant chromosomes. - **Option 3: Supernumerary chromosome** - These are additional chromosomes that are not essential for normal development and do not fit the description of giant chromosomes with many chromonemata. - **Option 4: Polytene chromosome** - These are giant chromosomes that are formed by the replication of DNA without cell division, resulting in many chromonemata. They are typically found in certain tissues of organisms like fruit flies (Drosophila). 3. **Conclusion**: - Based on the definitions and characteristics of the chromosomes listed, the correct answer is **Option 4: Polytene chromosome**. This type of chromosome is known for having multiple chromonemata due to its structure. ### Final Answer: The giant chromosome with a number of chromonemata is a **Polytene chromosome**. ---
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