Download Worksheet 1

Worksheet 1
NAME:__________________________________
DATE:___________
Use the data you have collected to answer the following questions.
1.
Create a tree diagram that illustrates the number of possible combinations of the following
traits: non-blue/blue eyes, can roll tongue/cannot roll tongue, and dark hair/light hair.
Using the Fundamental Counting Principle, how many different combinations should you
come up with?
2.
What is the probability that one of your peers would have all of the following
characteristics: dimples, bent pinky, and attached ear lobes? What is the probability of
each characteristic separately? For example, what is the probability of one of your peers
having dimples? Assume that it is equally likely to have each trait.
3.
What is the probability that someone in your classroom will have all of the dominant traits?
All of the recessive traits?
4.
If you were to use the data you collected from your classmates as a sample, what percent
of your school would have no dimples? Bent thumb? Widow’s peak?
5.
Now that you have answered a few questions, find the total number of students in your
grade. Set up a ratio, and predict the number of people that will have the following
characteristics.
Blue eyes:
Unattached ear lobes:
Straight hair line:
Dimples:
Straight thumb:
Light hair:
To answer the following questions, work with a partner. Using the individual data
about yourself, determine the probability of a child resulting from a cross of your
genetic traits having each particular characteristic.
6.
Set up a Punnett Square, and fill it in for eye color. What is the probability that a child
resulting from a cross of your genetic traits would have blue eyes?
7.
Set up a Punnett Square, and fill it in for hair color. What is the probability that a child
resulting from a cross of your genetic traits would have dark hair?
8.
Set up a Punnett Square for the ability to roll your tongue. What is the probability that a
child resulting from a cross of your genetic traits could not roll their tongue?
9.
Set up a Punnett Square for bent/straight pinky and widow’s peak/straight hairline. What is
the probability that a child resulting from a cross of your genetic traits would have a
straight pinky and a widow’s peak?
10. Set up a Punnett Square for unattached/attached ear lobes and bent back thumb/straight
thumb. What is the probability that a child resulting from a cross of your genetic traits
would have unattached ear lobes and a bent back thumb?