Source : Genetics Home Reference. Source :http://publications.nigms.nih.gov/thenewgenetics/chapter1.html#c1

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Source : Genetics Home Reference

Source :

WALT know what DNA is DNA stands for deoxyribonucleic acid. What is DNA made of? DNA is made up of nucleotides. Four types of nucleotides: A- adenine T- thymine C - cytosine G – guanine Nucleotides are held together by a backbone made of phosphate and deoxyribose. The nucleotides are sometimes referred to as "bases". The double helix structure was discovered by Watson and Crick in 1953.

kinetochore Source :

Source : newscenter.lbl.gov

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