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Genetics – the study of heredity At the end of this lesson you should be able to Define the term heredity 2. Example of heredity 3. Define the term gene expression 4. Example of a gene expression 5. Definition of a gene 6. Outline the role of a gene 7. Know the structure of a chromosome – refer to DNA and protein structure 1. Heredity is the passing on of features from parents to offspring by means of genes Also called Genetic Inheritance A gene is a length of DNA that codes for a specific protein It It is the unit of inheritance is found on a chromosome It contains instructions to make a particular protein It directly influences the characteristics of an organism Characteristics are controlled by genes. For example everyone has genes which determine hair colour. But not everyone has the same version of those genes. So there is more than one type of gene for hair colour that you could have. Not all genes are expressed Genes produce characteristics or traits that are inherited Eg: Gene for Tallness Organism is small – Why? Maybe due to poor nutrition Characteristics = heredity + environment Heredity is the passing on of _________ from parents to ______________ by means of ______. A gene is the unit __________________. They are found on a _________________. They contain ________________ to make a particular _______________. Gene expression is the way in which _____ ________ in a gene is decoded. Chromosomes contain a number of genes Chromosomes are made up of 60% protein 40% DNA Genes are arranged along the DNA of the chromosome Large sections of the chromosome do not contain genes This DNA is called Non Coding DNA It’s function is not yet clear Thread like structures Contain DNA Contain Protein Contain Genetic Information Occur in pairs Found in the nucleus of all cells Can you ……………. 1. 2. 3. 4. 5. Define the term heredity Define the term gene Outline the role of a gene Define the term gene expression Know the structure of a chromosome