dominant recessive wksht

Name:_________________________________

Dominant and Recessive Traits

Problem:
What are the phenotypes of some dominant and recessive human traits?

Procedure:

For your group, record how many of you have each of the traits listed in the table. Tongue rolling is the ability to roll the tongue into a U-shape. Free ear lobes are those that hang below the point of attachment to the head. Attached ear lobes are attached directly to the side of the head. A widow's peak is a distinct point in the hairline in the center of the forehead. Record your results in the data table.
Share your information with the class. Determine the percentage of the class who demonstrate each trait as follows: Divide the number of students who have the trait by the total number of students in your class and multiply by 100. Record the percentages in the data table.

Dominant Traits	Recessive Traits	Number of Students with Dominant Trait	Number of Students with Recessive Traits	Percentage with Dominant Trait	Percentage with Recessive Trait
Tongue Roller	Non-roller	.	.	.	.
Free ear lobes	Attached ear lobes	.	.	.	.
Non-red hair	Red hair	.	.	.	.
Dark hair	Light hair	.	.	.	.
Widow's peak	Straight hairline	.	.	.	.
.	.	.	.	.	.
.	TOTALS	.	.	.	.