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Genetics


            The Mutations of chromosome 15 that can cause disease.
             The genetic materials in a nucleus are made up of Deoxyribonucleic acid (DNA), which is .
             the main ingredient and protein.
             .
             1Structure of a Chromosome.
             A chromosome is a long coil of DNA, which is made up of genes, a unit of hereditary information. Chromosomes are arranged in pairs of homologous chromosomes where every animal and plant cells have their own number of chromosomes, called their diploid number. A chromatid is one of the two arms of a chromosome, which are joined by the centromere. Humans have 46 chromosomes. .
             .
             1 Illustration of the placement of genes in a chromosome.
             Genes are composed of a section of deoxyribonucleic acid (DNA). They act as a certain sequence of base pairs that codes for a certain trait/characteristic. As you can see above, every chromosome contains many genes. Nucleic acids are found in a cell's nucleus, which are responsible for storing and transferring genetic information. There are two types of nucleic acids; Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA). DNA contains the genetic information carried by every cell and guides the activities f the cell. Above are two strands of DNA, which are twisted into a spiral staircase shape; this is called the double helix. Nucleotides are the units from which nucleic acids are formed. There are four nucleotides made up of sugar molecules; Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). A always goes with T and G always goes with C; these are called complementary base pairs. A strip of the double helix is one gene, as you can see in the picture. .
             The genome is the entire genetic material of an organism. In 1988, an International Human Genome project was set up which began to recognize and identify the 46 chromosomes of every cell. The point of the project is for scientists to have a better understanding of how genetics contribute to human disease.


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