Natural selection lab - Local.brookings.k12.sd.us
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Transcript Natural selection lab - Local.brookings.k12.sd.us
MAKE A PREDICTION
How does camouflage affect survival rates?
http://animals.pppst.com/banner_camouflage.gif
SET UP
• Count out 50 black beads and place in box
• Count out 50 “other” color beads and place in
box
• Fill in the “AT START” columns on your data
sheet.
PERCENT OF TOTAL = ___# of beads__ X 100
total beads in box
FEEDING RULES
Keep your eyes OPEN!
Pick the FIRST ONE you SEE!
NO picking your favorite color!
Only pick ONE AT A TIME!
http://www.feebleminds-gifs.com/ani5.html
Swirl slowly, choose, repeat until
you remove 20 beads.
AFTER 1ST FEEDING
• Calculate number of black beads IN BOX
• Calculate number of “other” color beads IN
BOX
• Fill in “AFTER 1ST FEEDING” column on data
sheet.
PERCENT OF TOTAL = ___# of beads_ X 100
total beads in box
http://greenwood.alpinedistrict.org/Root%20Greenwood%20/images/pictures/Mom,%20Dad%20&%20Baby.jpg
http://pro.corbis.com/images/42-18867237.jpg?size=67&uid=%7B21E60102-7098-4CA2-B76E-6ACC29D9CA18%7D
REPRODUCE
Number of black beads in box ÷ 2
Add this many black beads to box
Number of “other” color beads in box ÷ 2
Add this many “other” color beads to box
Round UP for odd numbers of beads.
Fill in “AFTER 1st REPRODUCTION” column on data
sheet.
FEED AGAIN
Keep your eyes open!
Pick the FIRST ONE you SEE!
NO picking your favorite color!
Only pick ONE at a time!
http://www.feebleminds-gifs.com/ani5.html
Swirl slowly, choose, repeat until
you remove 20 beads.
AFTER 2nd FEEDING
• Calculate number of black beads IN BOX
• Calculate number of “other” color beads IN
BOX
• Fill in “AFTER 2nd FEEDING” column on data
sheet.
PERCENT OF TOTAL = ___# of beads_ X 100
total beads in box
http://greenwood.alpinedistrict.org/Root%20Greenwood%20/images/pictures/Mom,%20Dad%20&%20Baby.jpg
http://pro.corbis.com/images/42-18867237.jpg?size=67&uid=%7B21E60102-7098-4CA2-B76E-6ACC29D9CA18%7D
REPRODUCE
AGAIN
Number of black beads in box ÷ 2
Add this many black beads to box
Number of “other” color beads in box ÷ 2
Add this many “other” color beads to box
Round up for odd numbers of beads.
Fill in “AFTER 2nd REPRODUCTION” column on data
sheet.
FILL IN CLASS DATA SHEET
on projector with your group’s data
Copy the class data onto YOUR
Class data sheet