Some genes may mutate if mistakes are made in the process of DNA replication. For organisms, if genetic mutations lead to changes in traits, it is not good for them most of the time. However, this change is not absolutely unfavorable. Gene mutation has the characteristic of making organisms adapt to the environment better.

DNA replication is the basis of biological inheritance and the most basic process in all living things. This process is called semi-conservative replication, in which one of the first double-stranded molecules is used as a template for DNA replication to produce two identical DNA molecules.

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Characteristics of DNA replication:

1, semiconservative replication

During DNA replication, two identical double-stranded DNAs are synthesized with each strand of the parent DNA as a template, and each daughter DNA contains one strand of the parent DNA. This phenomenon is called semi-conservative replication of DNA. DNA is replicated in a semi-reserved way, which is proved by the experiments completed by m. Meselson and f. Stahl.

2. Replication has a certain starting point.

When DNA is replicated, it needs to start from a specific site, that is, some fragments with specific nucleotide sequences, that is, the starting point of replication. In prokaryotes, the starting point of replication is usually one, while in eukaryotes, it is multiple.

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