Download Face Lab Grandchildren

Name___________________________________
Face Lab Grandchildren
Purpose: During this activity, you will become the proud grandparents of a newborn child! Your
son or daughter has recently been married to another parent couple in the class, and the newly
wed couple is expecting their first child. You are excited to see if the child will have
characteristics similar to you and your wife, or if the child will look more like your in-laws!
Through this activity you will see how genes are passed through successive generations, from
parents to children to grandchildren (3 generations).
Procedure:
1. Working with your original partner, find another couple that has a child of the opposite
sex (if possible), and shake hands. Congratulations, your children just got married!
2. Although you are working as a group of four, each person needs to write answers to the
questions on a blank sheet of paper. Use the data chart from your children to complete
the following tasks. (Monohybrid Cross)
a. Using a punnett square determine the probability that your grandchild will have a
round or square face.
b. Using a punnett square determine the probability that your grandchild will have
almond or round eye shape.
c. Using a punnett square determine the probability that your grandchild will have
free or attached earlobes.
d. Using a punnett square determine the probability that your grandchild will have
freckles present or absent on their CHEEKS.
3. In your notebook, conduct a dihybrid cross to find the probability that your new
grandchild will have both connected eyebrows and thin lips.
4. Now that you have calculated the PROBABILITY that certain characteristics will be
present in your grandchild, it is time to see what your grandchild actually looks like! Fill
out the data chart for your grandchild by flipping a coin (provided at the front of the
room). Use the same packet that we used for your original children, but this time you’ll
be making a grandchild. One person can flip. All four people will write the results on
their own yellow data sheet.
a. Heads will be for dominant traits (capital letters) and tails will be for recessive
traits (lowercase letters). If your children had HOMOZYGOUS genotypes for
certain characteristics, they only have one type of gene they can pass on—there is
no need to flip the coin!
b. Complete the chart as you did for your own children, filling out the genotype and
phenotype for your grandchild.
5. One person in the group needs to draw a picture of the child. Find and take down the
original drawings of the parents (hanging on the wall). After you’ve answered the
questions below, place the happy family together back on the wall (parents next to each
other, child hanging below).
Questions (do NOT write on this paper):
1. Explain how the calculated probabilities for your grandchild did or did not relate to the
actual genotype/phenotype of your grandchild.
2. Which traits were present in the grandchildren that were not seen in past generations?
HINT: Did any recessive traits show up?
3. If a grandchild is heterozygous for a widow’s peak, is it possible that their future child
could not have a widow’s peak? Why or why not?
4. Flip through the face lab packet. List ALL traits that show incomplete dominance. Think
about it: How does the way KJ asks you to show incomplete dominance differ from the
way the packet shows incomplete dominance?
5. List ALL traits that are polygenic.
6. Explain why the inheritance for #28 is unique.
7. Look at all of the parents and offspring from the class. Explain the diversity that you
see. Use the terms sexual reproduction and genetic diversity. (2 complete sentences)
8. When you are all done, staple your yellow sheet to your answers.