Explain the meaning of DNA replication. To do this it is necessary to clarify the relationship between DNA replication and the survival of a species.1. DNA replication is vital for the survival of species as through replication identical copies of genes can be created, ensuring that it is able to repair itself when damaged (through the process of mitosis). DNA replication occurs when single-stranded chromosomes replicate to create double-stranded chromosomes, which are essential in the creation of daughter cells. It is necessary because for a zygote to undergo growth, double-stranded chromosomes are required, however when gametes are produced they are single-stranded, requiring DNA replication to produce double-stranded chromosomes. It also allows for variations to exist in species, through meiosis. This means that if factors such as environmental changes were to hinder the survival of a particular species, it would be able to produce altered genes to ensure better adaptations to the new conditions found within the gene, ultimately ensuring the survival of that species . .2. Explain the relationship between polypeptides and proteins. To do this it is necessary to clarify the relationship between the two. Amino acids are the building blocks of all proteins, which are complex molecules containing elements such as nitrogen, oxygen, carbon and hydrogen. Amino acids linked by peptide bonds create polypeptides. When there are many polypeptides linked together in a chain, and it is bent to perform a particular function, it creates a protein. However, if it were not folded into a certain shape, it would not become a protein, but only a polypeptide. Although ultimately both polypeptides and proteins are chains of amino acids, in... middle of paper... .ng genetics, there are both positive and negative aspects. The positive aspects include that by creating genetically modified species, you introduce diversity into an ecosystem, helping to promote the survival of the species. However, this is counteracted as in many cases the genetically modified species becomes predominant, resulting in a loss of diversity within the species, impacting its survival rate overall. Furthermore, transgenic species can have negative impacts on the wider environment, including animals and vegetation within the ecosystem. Furthermore, with recent transgenic species, it is difficult to predict the effects they will have on the environment as they have not yet been recorded and are unknown. The creation and use of transgenic species involves many questions, however it is a never-ending debate. It seems unlikely that this will be decided in the near future.