On this page, we will discuss the part that unwinds to become Chromosomes.

What are Chromosomes?

Chromosomes are bundles of tightly coiled DNA located within the nucleus of almost every cell in our body. Humans have 23 pairs of chromosomes.

DNA replication process

Replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. DNA replication is one of the most basic processes that occur within a cell. … To accomplish this, each strand of existing DNA acts as a template for replication.

DNA replication relies on two cellular enzymes:

  • Helicase – this unwinds a small portion of the DNA double helix to make it single-stranded. This process is often described as being analogous to undoing a zip; once the DNA is single-stranded, the nucleotide bases of the parent strand are exposed;
  • DNA polymerase – this fills the exposed gaps using the complementary base pairing rules. The result is two new daughter strands of DNA that are genetically identical to the parent strand.

DNA replication is often referred to as ‘semi-conservative’, as each daughter DNA double helix will have one strand derived from the original parent helix and one brand-new strand constructed from the nucleotides that have been slotted into their complementary base pairing positions by DNA polymerase.

Which part of the cell unwinds to become chromosomes?

Answers: Chromatin Network 

How do Chromosomes form?

The Part that Unwinds to become Chromosomes
The Part that Unwinds to become Chromosomes “chromatin network“: DNA wraps tightly around proteins called histones. DNA coils in a specific way to produce the structure of a chromosome.

Sources

https://medlineplus.gov/genetics/understanding/basics/chromosome/

https://www.yourgenome.org/facts/what-is-a-chromosome

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