Darwin’s Reasoning for Natural Selection Voyage of the Beagle Darwin’s Reasoning for Natural Selection
First Station: You will see 3 examples of living organisms. Write what you observe on each slide in the space provided on your handout, then write what pattern you observe and why you think you see this pattern…
Observation 1: SLIDE #1 This is a sunflower with a close-up of the seeds on one flower. Approximately, how many seeds do you see on the one flower?
Observation 1: SLIDE #2 Drosophila melanogaster are fruit flies. Each female can lay 400 eggs, which hatch after 12 hours.
Observation 1: SLIDE #3 Bacteria, like E. coli, can reproduce by binary fission at a fast rate.
Observation 2: We’re watching you. Stop goofing off! ;)
Observation 2: Here is a litter of kittens; what variability exists?
Observation 2: Their father Their mother
Observation 2: These zebra finches are siblings.
Observation 2: The father The mother
Observation 3: Here, a herd of zebras is running. Describe how they look as a group. (Hint: notice the effect of the stripes when the zebras are so close together…)
Observation 3: When the lion hunts the zebra, she isolates one to chase. She has trouble singling out one zebra from a running herd, due to the stripes.
Observation 3: Special zebra mutations:
Observation 3:
Observation 3:
Observation 4: This is a type of insect called a grub. Individuals of this species come in two sizes, big and small. Each individual can make 2 babies each breeding cycle. Watch what happens to them in two different environments.
Observation 4: FIRST SCENARIO
Observation 4: FIRST SCENARIO
Observation 4: FIRST SCENARIO
Observation 4: FIRST SCENARIO
Observation 4: FIRST SCENARIO Do you see the trend that has formed? What will happen to this population of grubs?
Observation 4: SECOND SCENARIO
Observation 4: SECOND SCENARIO
Observation 4: SECOND SCENARIO
Observation 4: SECOND SCENARIO
Observation 4: SECOND SCENARIO Do you see the trend that has formed? What will happen to this population of grubs?