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Using the table of summarized data, look at the data that compares cleft chin versus smooth chin. What conclusions can be made about the alleles for cleft chin and smooth chin?

Using the table of your class data, compare the columns that represent the dominant and recessive alleles for each trait. Describe any trends you notice between Column A and Column B.


Class Traits Data Table

Dominant Trait

A

Number of students

Recessive Trait

B

Number of students

Free earlobes



Attached earlobes



Hair on fingers



No hair on fingers



Widow's peak



No widow's peak



Curly hair



Straight hair



Cleft chin



Smooth chin



Smile dimples



No smile dimples




To find percents:

First, Column A + Column B= total number of students

Then, Divide column A by the total number of students

Last, multiply by 100.

Ex.

Free earlobes



Attached earlobes


12 + 5 = 17 so, free earlobes (12 / 17) * 100 = 70.59 %



We don’t need to do the math today. The website does it for us!



Class Traits Data Table

Dominant Trait

A

Percentage of Class

Recessive Trait

B

Percentage of Class

Free earlobes



Attached earlobes



Hair on fingers



No hair on fingers



Widow's peak



No widow's peak



Curly hair



Straight hair



Cleft chin



Smooth chin



Smile dimples



No smile dimples





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