Transcription of Genetics and Heredity Completed notes
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Genetics and Heredity Completed notes
TEACHER COPY DO NOT. Name: _____ Date:REMOVE FROM. _____ 123 _____. Period: Genetics and Heredity What is DNA? Cells use a chemical code called deoxyribonucleic acid or DNA. DNA carries all of the cell's instructions DNA is located in the nucleus During cell division it wraps around proteins to form chromosomes DNA is passed from parents to offspring DNA's Discovery In 1953, James Watson and Francis Crick discovered the structure of DNA. The work of Rosalind Franklin lead to Watson and Crick's discovery Franklin said DNA is made up of two spirals The Structure of DNA. DNA is called a double helix because it looks like a twisted ladder The sides of the ladder are made of alternating sugar (deoxyribose) and phosphate molecules The steps of the ladder are made up of a pair of nitrogen bases There are 4 types of nitrogen bases Adenine (A). Thymine (T). Guanine (G).
Pedigree Chart A pedigree chart is a diagram that shows which family members have a certain trait. It is like a family tree that shows different generations. Pedigree Chart Each row in the chart shows a different generation of family members. Squares = males Circles = females A circle and square connected by a straight line show parents
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