Background information Many characteristics in humans are controlled by one gene with two alleles, one dominant and one recessive Three
examples are shown below.
Unattached
earlobe
Attached
earlobe
Tongue-roller
Non-roller
Straight therub
Bent
(hitchhiker's)
thumb
Recessive
Dominant
ethod
Recessive
Dominant
Recessive
Dominant
2.
Select 20 learners that will form part of your sample
3
For every learner selected, record the phenotype for each characterstic
Record the information for each learner in a table. At the end of the table, include the percentage of learners
displaying each phenotype for each of the three characteristics
Answer the questions set.
Questions
List any FOUR planning steps for this investigation
2
In terms of the investigation about the type of earlobe (free or attached), name the following​