Genetics and Evolution. Mary Susan Mardon. Nucleotides. Building blocks of DNA and RNA. Each nucleotide contains: phosphate group. deoxyribose (DNA), ribose (RNA) nitrogen base. * adenine * cytosine
Mary Susan Mardon
* adenine * cytosine
* thymine * guanine
G1 phase-----Cell growth, synthesize new proteins, organelles
S phase-----Chromosomes replicated, DNA synthesized
G2 phase-----production of molecules and organelles, shortest of the 3 phases
A process called reduction division in which the number of chromosomes in a human reproductive cell is reduced to 23 chromosomes. These cells are haploid (n).