Download - Cootie Genetics
Cootie Genetics
http://www.cbguidesblog.com
http://en.m.wikipedia.org/wiki
What happened to the traits from the Cootie
from the East?• Hypothesize what happened to the traits• Design an experiment to test that hypothesis• Predict your results based on your hypothesis• Conduct your experiment
Mating the second generation Cooties
To make a cootie baby:1.) Both mom and day reach into cup #1 and bring out a body color factor (red or blue cube), the information will be recorded on the computer2.) Both mom and day reach into cup #2 and bring out the ear type factor (white or black cube), record this information3.) Both mom and day reach into cup #3 and bring out the eye type factor (purple or yellow cube), record this information4.) Both mom and day reach into cup #4 and bring out the mouth type factor (light green or orange cube), record this information5.) Both mom and day reach into cup #5 and bring out the foot type factor (brown or green cube), record this information
What does your baby look like? Was your hypothesis supported or refuted? Do you need to make more babies to figure out what is going on? Remember, keep it random, nature cannot pick out specific trait factors. Make 40 babies total.
Why are their two color cubes in your
cups?
Cootie from the East Cootie from the West
Red R Blue r
Wide Ear W Bow w
Plain eye P Lashes p
Lips L Tongue l
Boots B Feet b
Cootie Traits
Cootie DataTotal # of Total # of Total # of Total # of Total # of Total # of
RR Rr rR rr Red blue 9 12 9 10 30 10
WW Ww wW ww Wide-ear bow 10 15 6 9 31 9 PP Pp pP pp Plain-eye lashes 10 9 10 11 29 11 LL Ll lL ll Lips tongue11 11 9 9 31 9 BB Bb bB bb Boots feet 9 13 9 9 31 9
What does it all mean
• Trend—30:10 ratio of traits from the east versus traits from the west—or 3:1 ratio of dominant to recessive phenotypes
• Trend—10:10:10:10 ratio of trait factors RR, Rr, rR, rr—or 1:1:1:1 ratio. • Rr and rR are the same thing– 1:2:1
ratio of Homozygous dominant (RR) to Heterozygous (rR & rR) to Homozygous recessive (rr) genotypes
Punnett Square for the Homozygous Cooties—first
generation mating
R
r
Cootie from the East
Cootiefrom the west
R
RR
R R
r r
rrr
Punnett Square for the Heterozygous Cooties—second
generation mating
R
r
First Generation OffspringFir
st G
ener
atio
n Off
sprin
g
R RR r
r
r
R
r R r