Heredity Simulation
1. The image shows a male and female hornimonster, each with different genetic traits. The allele for one horns is dominant over the allele for two horns.
MALE FEMALE
Which hornimonster has the dominant allele? _______________
2. Obtain four red wooden sticks that will represent the chromosomes of your parents. Arrange them so that the male’s set (Hh) is on one side and the female’s set (hh) is on the other side. The M1,M2, F1, F2 labels will help you if you get them confused.
3. Flip the sticks over so that you can’t see their labels. Choose one chromosome from the mother pile and another from the father pile. This represents the chromosomes each parent is “donating” to the next generation.
4. Data (Repeat the exchange 12 times to produce 12 offspring)

Genotype (letters) 
Phenotype 
Offspring 1 


Offspring 2 


Offspring 3 


Offspring 4 


Offspring 5 


Offspring 6 


Offspring 7 


Offspring 8 


Offspring 9 


Offspring 10 


Offspring 11 


Offspring 12 


5. Math: Determine the PERCENTAGE of each phenotype of offspring from your data table. Percentage is determined by taking a part and dividing by the whole and multiplying by 100. Show your work.
% that have two horns ____________________ # of offspring with 2 horns =
Total number of offspring
% that have one horn ____________________ # of offspring with 1 horn =
Total number of offspring
6. Show the cross using a Punnett square. Hh x hh









7. From the cross above, what is the phenotypic ratio of the offspring?
8. Convert the phenotypic ratio into PERCENTAGES of each phenotype of the offspring.
9. Compare this percentage to your simulation (where you flipped the sticks). Does the Punnett square predictions match the results of your crosses?
A. They are exactly the same 
B. They are close to the same 
C. They are very different 
D. I have no idea

10. What if the female had the genotype Hh. Show the cross between the new parents Hh x Hh






11. From the cross above, what is the phenotypic ratio of the offspring?
12. From the cross above, what is the genotypic ratio of the offspring?
13. The allele for curly is dominant over the allele for straight tail. Which hornimonster(s) has/have the dominant allele? _______________
14. Obtain four yellow wooden sticks that will represent the chromosomes of your parents. Arrange them so that the male’s set (Tt) is on one side and the female’s set (Tt) is on the other side. The M1,M2, F1, F2 labels will help you if you get them confused.
15. Flip both the red sticks and the yellow sticks over so that you can’t see their labels. Choose one red and one yellow chromosome from the mother pile and one red and one yellow chromosome from the father pile. This represents the chromosomes each parent are “donating” to the next generation.
16. Data (Repeat the exchange 12 times to produce 12 offspring)

Genotype (letters) 
Phenotype 
Offspring 1 


Offspring 2 


Offspring 3 


Offspring 4 


Offspring 5 


Offspring 6 


Offspring 7 


Offspring 8 


Offspring 9 


Offspring 10 


Offspring 11 


Offspring 12 


17. Math: Determine the PERCENTAGE of each phenotype of offspring from your data table. Percentage is determined by taking a part and dividing by the whole and multiplying by 100. Show your work.
% that have two horns, curly tail ____________________
% that have two horns, straight tail ____________________
% that have one horn, curly tail ______________________
% that have one horn, curly tail ______________________
18. Using the FOIL method, what are the four possible gametes formed by the male hornimonster?
19. Using the FOIL method, what are the four possible gametes formed by the female hornimonster?
20. Show the cross using a Punnett square. HhTt x hhTt

























21. From the above cross, list the genotypes, frequencies and phenotypes
22. From the cross above, what is the phenotypic ratio of the offspring?
23. Convert the phenotypic ratio into PERCENTAGES of each phenotype of the offspring.
24. Compare this percentage to your simulation (where you flipped the sticks). Does the Punnett square predictions match the results of your crosses?
A. They are exactly the same 
B. They are close to the same 
C. They are very different 
D. I have no idea 