1. “Why the Heck are we doing this FACE LAB?”
Question:
List the traits you have inherited (that you were given from your parents)
Did you get to pick your traits?

2. How many genes do you have?1 2 4 23 46
2,300
3,200
32,000 25
Seconds
Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

3. Where are these traits (GENES) located?25
Seconds
Remaining
Chromosomes
In Parents
Cellular Membrane
DNA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

4. Remember! You get 1 chromosome per trait from your mom.
You get 1 chromosome per trait from your dad.
Therefore, you have chromosome(s) per trait.

5. Look at your lab Why are there two letters written for each trait?
Each letter represents a gene from each parent
Capital Letters represent DOMINANT genes
Lower case represent recessive genes

6. Face Shape
A combination of letters represents the combination of genes that were inherited. This is a GENOTYPE.
What does Rr look like for face shape?
Round – R is dominant allele
What does rr look like for face shape?
Square – r shows up because it is the recessive allele
How the genes actually look expressed in the organism is called its PHENOTYPE.

7. Genotypes
The combination of genes that make up a genotype can be either
Homozygous
Both genes are either dominant or both are recessive
Example: RR or dd
Heterozygous
There is each type of gene is represented
Example: Rr or Dd

8. What are the possible genotypes for Chin Shape?CC cc Cc
All of the above
None of the above 25
Seconds
Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

9. Which genotype is heterozygous?25
Seconds
Remaining
Cleft Chin CC
No Cleft Chin Cc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

10. Which phenotype is homozygous dominant?CC
Cleft Chin Cc
No Cleft Chin 25
Seconds
Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

11. Self Quiz What was your kid’s genotype for widow’s peak?
What are the possible phenotypes for eye size?
W= Green Leaves & w = white leaves in corn plants. If a corn plant is Ww, then what would its phenotype be?
Is the corn plant in question #3, heterozygous or homozygous?
Where do the corn plants get their genes?

12. Types of Inheritance Dominant/Recessive
Type of inheritance where there is a pure dominant allele and pure recessive allele
Co-Dominant/Incompletely Dominant
Type of inheritance where the alleles are equal or mostly equal. There is not a pure dominant or pure recessive allele
Polygenic
Type of inheritance where there is more than one gene that controls the trait.

13. Face Lab Conclusion
WARNING: This is a “quality” assignment, you must get a B or you will get it back for corrections.
Label the traits on the face lab as D/R, CoD or Poly.
Tell the story of how genes are passed on to make facial traits. Use a specific example along with the words below.
Meiosis
Genes
Chromosome
Genotype
Phenotype

14. Predicting which gene you get
Face Shape = R: (Alleles = R – Round, r - Square)
Parent #1 genotype is Rr
Parent #2 genotype is rr
They want to have a child:
Parent #1 can pass on a or
Parent #2 can pass on a or
To keep everything straight we use a PUNNETT SQUARE

15. Punnett Square Each Box is worth a 25% or 1 out of 4 R r r r R r r r R
Parent #1
Parent #2
Each Box is worth a 25% or 1 out of 4 R r
R r
r r r r
R r
r r

16. Problem
You have two heterozygous parents that each have Almond shaped eyes. They are having a baby. What are the possible genotypes it could have and the possibility of getting each one?
What are the possible phenotypes and the chances?