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 Centromere

What is a chromosome made of?

Fig

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

mRNA’s from 5 genes in fruit-fly embryo Why isn’t every gene expressed in every cell?

Fig Gene Regulation= Controlling if a gene makes a functional product (protein) or not

DNA methylation pg. 358 CH 3

Euchromatin and Heterochromatin

Fig

Fig

Fig

Diagram meiosis of the X and Y chromosomes in spermatogenesis… Start with a G1 cell.