1. Hand in your labs so I can give you credit! (Retinoids, UV, Fluke)
April 26, 2010
Hand in your labs so I can give you credit! (Retinoids, UV, Fluke)
Of the three causes we looked at Friday, which do you think is most likely responsible for frog malformations? Why?
How many chromosomes do humans have? How many copies of each chromosome?

2. Levels of Organization
Nucleotides 
DNA 
Genes 
Chromosome 
Nucleus 
Cell

3. Levels of Organization
Chromosome = lots of DNA
Usually shown as Xs
23 sets in humans (total 46)
First 22 sets of chromosomes called autosomes
23rd set of chromosomes called sex chromosomes
Females XX, Males XY
Shown in a karyotype