class genetics survey
TRANSCRIPT
DQ 2-25-10
• What is genetics?
• What is a trait?
Class Genetics Survey
• Problem: Are traits controlled by dominant alleles more common than traits controlled by recessive alleles?
• Page 92 in book
Data Table
Total Number Students: ______
Trait 1 Number Trait 2 Number
A Free Ear lobes Attached Ear Lobes
B Hair on Fingers No Hair on fingers
C Widow’s Peak No widow’s peak
D Curly Hair Straight Hair (&wavy)
E Cleft Chin Smooth Chin
F Smile dimples No smile dimples
Period 7
Class Trait Numbers
Conclusion Questions
1. The traits listed under Trait 1 in the data table are controlled b dominant alleles. The traits listed under Trait 2 are controlled by recessive alleles. List the traits controlled by dominant alleles that were shown by a majority of students (more than half the class):
List the traits controlled by recessive alleles that were shown by a majority of students (more than half the class):
http://www.ncrtec.org/tl/camp/gene/thumbs.htm
No hitchhiker’s thumb
Hitchhiker’s thumb
Clinodactyly
(bent pinky finger)
Data Table
Total Number Students: ______
Trait 1 Number Trait 2 Number
A Free Ear lobes Attached Ear Lobes
B Hair on Fingers No Hair on fingers
C Widow’s Peak No widow’s peak
D Curly Hair Straight Hair (&wavy)
E Cleft Chin Smooth Chin
F Smile dimples No smile dimples
Period 1
Class Trait Numbers
Data Table
Total Number Students: ______
Trait 1 Number Trait 2 Number
A Free Ear lobes Attached Ear Lobes
B Hair on Fingers No Hair on fingers
C Widow’s Peak No widow’s peak
D Curly Hair Straight Hair (&wavy)
E Cleft Chin Smooth Chin
F Smile dimples No smile dimples
Period 2
Class Trait Numbers
Data Table
Total Number Students: ______
Trait 1 Number Trait 2 Number
A Free Ear lobes Attached Ear Lobes
B Hair on Fingers No Hair on fingers
C Widow’s Peak No widow’s peak
D Curly Hair Straight Hair (&wavy)
E Cleft Chin Smooth Chin
F Smile dimples No smile dimples
Period 5
Class Trait Numbers
Data Table
Total Number Students: ______
Trait 1 Number Trait 2 Number
A Free Ear lobes Attached Ear Lobes
B Hair on Fingers No Hair on fingers
C Widow’s Peak No widow’s peak
D Curly Hair Straight Hair (&wavy)
E Cleft Chin Smooth Chin
F Smile dimples No smile dimples
Period 6
Class Trait Numbers