Answers: Genes, alleles, nucleotide sequence • Questions: – You share 99% of your ___________ with a chimpanzee. – You share 60% of your ___________ with a banana. – 50% of your ___________ came from your mother. • What is a gene? Fig. 18.8 • Draw the cell cycle. • Why does the cell cycle matter? Fig. 12.5 Mitosis • Draw a chromosome as it would look at each stage of the cell cycle. Fig. 5.28 Fig. 12.4 Centromere • What is a chromosome made of? Fig. 16.21 Histones are critical for DNA structure What makes the dominant allele dominant? Sickle cell? Cystic fibrosis? Huntington’s disease? Blood type? Mendel’s wrinkly peas? • What is the central dogma of genetics? Fig. 17.4—The Central Dogma of Genetics Transcription Analogy Who is the scribe? Translation Analogy Who is the chef? Fig. 17.25 mRNA’s from 5 genes in fruit-fly embryo Why isn’t every gene expressed in every cell? Fig. 18.6 Gene Regulation= Controlling if a gene makes a functional product (protein) or not DNA methylation pg. 358 CH3 Euchromatin and Heterochromatin http://cnx.org/content/m26565/latest/graphics35.jpg Fig. 18.10 Fig. 18.11 Fig. 18.13 • Diagram meiosis of the X and Y chromosomes in spermatogenesis… Start with a G1 cell.