Biology Inheritance Principle part 20 (Chromosomes, Chromatin, Chromatids) class 12 XII | Summary and Q&A

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May 4, 2015
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Biology Inheritance Principle part 20 (Chromosomes, Chromatin, Chromatids) class 12 XII

TL;DR

This video explains the role of chromosomes in inheritance, including the structure of chromatin, the formation of chromosomes during the resting stage of a cell, and the duplication of chromosomes to form sister chromatids.

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Questions & Answers

Q: What is the composition of chromatin?

Chromatin is composed of DNA, RNA, and histone and non-histone proteins.

Q: When do chromosomes form?

Chromosomes form during the resting stage of a cell when chromatin condenses together.

Q: What is the purpose of duplicating chromosomes?

Duplicating chromosomes allows for the distribution of genetic material to multiple cells during cell division.

Q: What are sister chromatids?

Sister chromatids are duplicate copies of a chromosome connected at the centromere, and they separate during cell division.

Summary & Key Takeaways

  • Chromatin is a thin thread-like structure composed of DNA, RNA, and proteins, and it exists during the resting stage of a cell.

  • Chromosomes are rod-shaped structures formed when chromatin condenses together during cell division.

  • Sister chromatids are duplicate copies of a chromosome connected at the centromere, and they separate during cell division.

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