Name ______Roll # ______Date ______
Genetics: Through the eyes of another world
The One-Eyed Easy Temper Loser Monster
In a land far away there lives a community of monsters. Most of these monsters have one eye and easily lose their tempers. However, some of the population have 2 eyes and have mild manners.
While usually this is not that big of a social issue, the King and Queen of the One-Eyed Easy-Temper Looser Monsters have been thinking about a possible heir. Their concern of course is that they might have a mild mannered offspring, which the King does not feel could rule a country of mostly temper-losers. They want to know what chance, if any, they would have of having a mild mannered offspring.
So the King and Queen have decided to have a meeting of the great minds of the time—including genetic counselors, a local medicine man, Mr. Gregor Mendel, and YOU. After explaining the situation, to the committee, you all work together to tackle the problem.
Mr. Mendel figures out that having one eye and losing their temper are both dominate traits because they are the traits that appear more commonly in the population. So you assign the following letter for the traits
One eye = E Temper-loser = T
Two eyes = e Mild temper = t
The medicine man is able to decipher that the King is heterozygous for both traits, while the Queen is two-eyed and heterozygous for losing her temper.
1) What are the genotypes (4 letters) for the King ______Queen ______
With Mendel’s help you must figure out all the gamete possibilities for both King & Queen Believing in independent assortment, you determine that the gametes are as follows: (2 letters per line)
2) King ______Queen ______
3) Now that you have the possible gametes, you decide to use a dihybrid punnet square to determine all of the possible geneotypes for the King & Queen’s offspring. Go for it!
4) Mendel suggest that you figure out all possible phenotypes, not just Temper-losing just in case the King wants to know (His temper is terrible you know!) List all possible phenotypic results with their numbers below.
5) What is the phenotypic ratio? ______
When you, Mendel, and the other great minds meet back with the King, you explain what you have found. He goes crazy saying he doesn’t understand what conclusion you have come to. He wants to know the percentage of children that could possibly be mild tempered. Back to the drawing board!
6) % children that may have mind tempers (fraction & percent) ______
Going back to the King, he is able to keep his temper under control long enough to ask more questions. You are the spokesperson for the group and must field all of his questions. Good luck!
7) How could my Queen and I have a two-eyed, mild mannered monster baby, if both of us are temper-loser monsters? That doesn’t make sense!
8) I expected since I have one eye and my Queen has 2 eyes (I love her anyways!) that some of our baby monsters would have 3 eyes. Why was this not one of the possibilities you shared with us?
9) If we did—heaven forbid—have a child that was mild mannered, would there be any possibility that we could have “normal” (temper-losing) monster grandchildren? Why/why not?
10) What would the genotype of a homozygous one-eyed and heterozygous temper-loser monster be?
11) What would be the genotype of a two-eyed, mild tempered monster?
Now, the King wants your professional opinion. He and his Queen do NOT want mild mannered offspring. They want to know if they should take a “chance” and try to have a baby monster of their own, or if they should adopt. What do you tell him? You are the scientific professional. In your response, give him the scientific facts (use your math to support your answer) but you also need to address the possible social issues that plague the King.
12) Should the King & Queen try to have their own monster baby? q Yes q No