Chapter 8: DNA, Structure and function Riley Coughlin

Watson and crick were credited with the idea that DNA took the shape of the double helix. They made models to show people. Rosalind Franklin made the first discovery but credit was given to Watson and crick.
Chargaff's first Rule- the amount of thymine and adenine are identical as are the amounts of cytosine and guanine. Chargaff's second rule- DNA of different species differs in its proportions of adenine and guanine.
Hydrogen bonds between the internally positioned bases are what keeps base pairs together.
A chromosome is a structure that consists of DNA abs associated proteins. Chromosomes duplicate when DNA splits in DNA replications. Most Cells have one DNA molecule per chromosome.
A karyotype is the visual appearance of the chromosomes in the cell nuclei of an organism or species.
DNA replication occurs in all livings things on earth. DNA is made of two strands that form a double helix. During replication these strands separate. Each strand then serves as a template to make its counterpart this makes double the DNA.
Things that damage DNA include ionizing radiation from X-rays, most uv light. Damage can cause mutation in the DNA and genes which will then lead to problems with the offspring or child.


Created with images by Caroline Davis2010 - "DNA model" • rocksee - "K'nex DNA" • Hey Paul Studios - "Human Chromosome Chart" • Hey Paul Studios - "Female Karyotype, 2014" • Caroline Davis2010 - "DNA" • burge5k - "DNA"

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