basics - BasicsofReproductive Biology Molecules to Gametes...

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Basics of Reproductive  Biology   Molecules to Gametes
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DNA: the code of life DNA is deoxyribonucleic acid The molecule is a “double helix” which is made of complementary strands The molecule contains the information needed to construct the organism A gene is a section of DNA that influences one or more hereditary traits in an individual. Different versions of a specific gene are called alleles . Most DNA is in the nucleus of the cell P=phosphate S=sugar ATCG=Bases (adenine, thymine, cytosine, guanine)
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DNA: the code of life The nitrogenous base sequence of DNA stores information required for all living cells, and complementary base pairing provides a simple mechanism for DNA replication, since each strand can serve as a template for formation of a new complementary strand
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DNA: replication Summary
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DNA Replication
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DNA Replication
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DNA to RNA DNA codes for RNA (ribonucleic acid) There are three kinds of RNA; all are single stranded RNA codes for amino acids Amino acids are combined into proteins, the chemicals that make up the structures of the cell such as enzymes and hemoglobin RNA has a phosphate and a sugar and 4 bases, adenine, uracil, guanine and cytosine. The sugar is ribose. A codon is the genetic code.
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DNA and Chromosomes Unless the cell is about to divide, DNA is in diffuse strands in the nucleus as chromatin As chromatin, DNA is involved in the coding of RNA As replication begins the DNA begins to condense into chromatids. Two chromatids together form a chromosome.
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The Cell Cycle There are two types of cell division: meiosis and mitosis
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basics - BasicsofReproductive Biology Molecules to Gametes...

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