POD 2/13 or 2/14

1. What is a trait?

2. What is a dominant trait?

3. What is a recessive trait?

Do you have these Traits?

• Attached Earlobes• Tongue Rolling• Dimples• Right-Handed• Freckles• Straight Hair• Cleft Chin• Allergies• Hitchhikers Thumb• Widow’s Peak

Problem• Are dominant traits or recessive traits

more common?

Hypothesis• If people are surveyed about their traits, then we will learn…

– Dominant traits are more common– More people have traits that are recessive– Etc.

Inventory of My Traits Lab

Method

1. Take Survey.

2. Graph the class results of the survey.

3. Graph the percent of people in the general population with the trait.

DataTrait My

Answer

Class

YesClass

No

Attached Earlobes

Tongue Rolling

Dimples

Right-Handed

Freckles

Straight Hair

Cleft Chin

Allergies

Hitchhikers Thumb

Widow’s peak

Class Graph

Atta

ched

E

arlo

bes

To

ngu

e Ro

lling

Dim

ples

Rig

ht Ha

nde

d

Fre

ckles

Straig

ht Ha

ir

Cle

ft Ch

in

Alle

rgie

s

Hitch

hike

r’s T

hum

b

Wido

w’s P

eak

Nu

mb

er of S

tud

ents in

Cla

ss w

ith Tra

it

General Population Graph

To

ngu

e Ro

lling

70

%

Rig

ht Ha

nde

d 9

3%

Hitch

hike

r’s T

hum

b 25

%

Pe

rcen

t of P

eo

ple in

Gen

era

l P

opu

lation w

ith T

rait

Dominant or RecessiveTrait (Phenotype) Dominant or

RecessivePossible Genotype

Attached Earlobes

Tongue Rolling

Dimples

Right-Handed

Freckles

Straight Hair

Cleft Chin

Allergies

Hitchhikers Thumb

Widow’s peak

Recessive

Recessive

Recessive

Dominant

Dominant

DominantDominant

Dominant

Dominant

Recessive

Conclusion

• Which dominant traits are more common?

• Which recessive traits are more common?

• Are dominant traits or recessive traits more common (in general)?