Dawkins, River out of Eden 1995“The river of my title is a river of DNA, and it flows through time, not space. It is a river of information, not a river of bones and tissues.” Introduce yourself to your neighbors if you do not know them!

• What do you notice about this statement?? Are there parts of it that you like? Parts that don’t make sense?

• Draw a sketch of the Mississippi flowing through the midwest…which way would the river of DNA flow?

• If DNA is a river through time does all the DNA make it through time?

• He states that “Organisms are mere temporary bodies, while genes are immortal.” Your thoughts?

http://pittsburghpermaculture.org/wp-content/uploads/2010/06/Mississippirivermap.png

We are….

Fern Life cycle p 506

WITHOUT a text book or web and without consulting your neighbors draw a cell that is……2n=6 (Do you know what this means?)

• Three chromosomes different lengths. • Mom one color, copy from dad a different

color.

• Draw this cell going through mitosis (you may have learned this in detail with names of different stages but focus on what happens rather than labeling different stages).

• Draw this cell going through meiosis!

Which of the following transmits genes from both parents to child, or from one generation of a

family to another?

• DNA• gametes• somatic cells• mitosis• nucleotides

Fertilization is to zygote as meiosis is to which of the following?

• mitosis• diploid• chromosome• replication• gamete

Privet shrubs and humans each have a diploid number of 46 chromosomes per cell. Why are the

two species so dissimilar?

• Privet chromosomes undergo only mitosis.• Privet chromosomes are shaped differently.• Human chromosomes have genes grouped

together differently.• The two species have appreciably different

genes.• Privets do not have sex chromosomes.

Diploid cells may undergo either mitosis or meiosis. Can haploid cells? Why or why not?

What image goes where meiosis I (a-d) and meiosis II (e-h) and what clues did you use to decide where to place each image?

1. Lets start with the basics…..What is sex?

2. What are some of the costs of sex? In other words why can asexual reproduction be so great! (noted in the article or others that you can come up with!)

3. What was Kondrashov’s hypothesis for the evolution of sex?

4. What does the Red Queen hypothesis focus on…….?

5. What did researchers find in different topminnow populations?

This diagram illustrates how sex might create novel genotypes more rapidly. Two advantageous alleles A and B occur at random. The two alleles are recombined rapidly in a sexual population (top), but in an asexual population (bottom) the two alleles must independently arise