1. Power Study: Probability and Genetics Quiz
For Mrs. Schworer

2. Match the terms that goes together
Heterozygous
Trait
Phenotype
Hybrid
Homozygous
Purebred
Allele

3. Definitions
Phenotype - the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment. (trait)
Genotype - he genetic constitution of an individual organism. (Allele)
Homozygous - having the two genes that are the same. (Purebred)
Heterozygous – having two genes that are different. (Hybrid)

4. Heterozygous or Homozygous
Classify each of the following gene pairs as heterozygous or homozygous RR _________ ff __________ Tt __________ Ll __________
Homozygous
Homozygous
Heterozygous
Heterozygous

5. Purebred brown hair color - _______ Hybrid with widows peak:______
TRAIT
DOMINANT GENE
RECESSIVE GENE
Hair Color
Brown - B
Blonde - b
Widows Peak
With Widows Peak - W
Without Widows Peak - w
Dimples
With Dimples - D
Without Dimples - d BB
Purebred brown hair color - _______
Hybrid with widows peak:______
Heterozygous with dimples: ______
Homozygous blonde hair color: ______ Ww Dd bb

6. Round eyes (R) are dominant to Oval eyes (r) in Mrs. Schworer’s family
Round eyes (R) are dominant to Oval eyes (r) in Mrs. Schworer’s family. Give the PHENOTYPE for each of the genotypes below.
RR - ______________
Rr - _______________
rr - _______________
Round eyes
Round eyes
Oval eyes

7. Long nose – L Short nose - l
Donald Duck is heterozygous for a long nose. He recently married Daffy Duck with homozygous for a stubby nose.
Donald Duck (heterozygous for long nose) = __________
Daffy Duck (homozygous for stubby nose) = __________
COMPLETE THE PUNNETT SQUARE Ll ll L l l Ll ll l Ll ll
Percentage for long nose? ______% Percentage for stubby nose________% 50 50

8. What is Codominant? Codominance is ……
A. Codominance is when a heterozygous organism will express or show both dominant alleles for a trait.
B. Codominance is when nothing is dominant.
C. Codominance is when a homozygous organism will express or show both dominant alleles for a trait.

9. Codominance
In horses theres is a codominance; (B) is the symbol for black, (W) is they symbol for white, and (BW) is the symbol for black and white.
Cross a homozygous black male horse with a homozygous white female horse. B B W BW BW W BW BW
Genotypes of offspring:
______________________
Phenotypes of offspring:
______________________ BW
Black and White

10. Multiple Alleles
If Ryan has the blood type O and is married with Deanna who has the blood type A, she would be homozygous for this blood type, what blood types could their children have? Remember to use I , I , and I for the alleles. A B i i IA
IA i
IA i IA
IA i
IA i A
The children would have blood type(s): ________________

11. Incomplete Dominance
Bob the gardener is growing roses that come in the colors red (RR), white(WW), and pink (RW).
What would happen if Bob crossed a pink flower with a red flower? R W
How many plants would be red? ___________%
How many plants would be white? _________%
How many plants would be pink? __________% 50 R RR RW R RR RW 50

12. Continue to look over your worksheets!
Keep practicing past work and reviewing your terms!
BEST OF LUCK! Take your time on the quiz and I know you will all do great 