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Unit 34 Human Inheritance

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Unit 34 Human Inheritance
Explain key principles of genetics using examples relating to inheritance in humans (P4)
Genetics can be defined as the study of heredity, the biological process whereby the parent passes on genes to the child (newsmedical, 2013). This means that every child will inherit genes from both of their parents. The genetic information is located within the nucleus of the cell.
A genome is all of the individual’s genetic material and is made of DNA. It contains genes, packed in chromosomes, which give specific characteristics. This means that one gene may determine the colour of an individual’s hair while the other gene determines the colour of their eyes. The number of genes that the genome contains varies from each …show more content…
These chemical bases are known to be part of DNA (newsmedical, 2013). The sequence in which these bases are presented determines the information used for building and maintaining the individual (Campton, 2012). The bases pair up with each other i.e. A with T and C with G. These bases are then attached to a phosphate and a sugar which make up the nucleotide. These bases pair the way they due to the fact that purines will only pair with a pyrimidine i.e. A is a purine, paired to T which is a pyrimidine and G is a purine which will only pair with the pyrimidine C (NCBI, 2002). Purines and pyrimidines are vital to build the molecules which carry the genetic coding. Complementary base pairings is the term use to describe these base pairings (Campton, …show more content…
They often act as biological markers, meaning that genes associated with diseases can be found more easily (GHR, 2015). If a SNP occurs within a gene it can play a direct role in affecting the functioning of that gene (GHR, 2015).
Every individual has a genotype and phenotype. The genotype refers to the set of genes as a whole that the individual has, whereas, the phenotype is the expressed traits/characteristics from the alleles (pair of genes, determining heredity characteristics) e.g. eye colour and hair colour.

Reference list
Newsmedical, 2013. What is genetics? [Online] Available at; http://www.news-medical.net/health/What-is-Genetics.aspx [Accessed 22nd October]
Campton, J. (2012) CCEA Biology AS student Unit Guide: Unit 1 New Edition Molecules and Cells. Deddington: Oxfordshire
National Center for Biotechnology Information, 2002. The Structure and Function of DNA [Online] Available at; http://www.ncbi.nlm.nih.gov/books/NBK26821/ [Accessed 23rd October]
Genetic Home Reference, 2015. What are single nucleotide polymorphisms? [Online] Available at; http://ghr.nlm.nih.gov/handbook/genomicresearch/snp [Accessed 23rd

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