Ok, so I've got a take-home quiz for my bio class that's due tomorrow (I was absent last week and didn't know that the due date was changed =/).
I've got pretty much all of the other problems down, but this one is just too confusing (probably because it's a long question).
3. You are a breeder of a type of aquarium fish you sell to pet stores. This species is colored red, and you raise thousands of these fishes. One day, you find that there is a mutant blue fish in the tank, and you wish to find out the genetics of this color. You raise this blue fish and mate it to a red fish (this is the first mating). This couple produces 120 eggs which hatch into babies that grow up into 58 blue fish and 62 red fish. You then take some of these 58 blue fish and mate them together; of the five such blue X blue matings, you get the following results (by brood): (1) 90 blue and 29 red, (2) 85 blue and 28 red, (3) 83 blue and 27 red, (4) 91 blue and 30 red, and (5) 92 blue and 31 red. When you mate any of the 62 red fishes together from the first mating, you always get all red offspring. In fact, no matter where the red fishes come from, when you mate any two red fishes together, you always get only red offspring. You take some of the blue fishes from the brood of 90 blue and 29 red fishes and you mate some of the blue fishes together. You find that some of these matings of blue X blue produces a brood of all blue fishes but many of the other blue X blue matings do not produce this kind of result (producing instead a mixture of red and blue fishes, with blue fishes being more common than red fishes). What is the simplest explanation for these results?
A. Give the pattern of inheritance for blue and red color in this species of fish.
B. Give the genotypes for the original blue and red fish (that were first mated together).
C. Give the Punnett Square and the resulting expected genotypic and phenotypic ratios for the offspring of the first mating of blue and red fish.
D. Consider the second group of matings, where you took some of the 58 blue fishes and mated them together. Give the mating (genotypes of the mated fish) and resulting Punnett Square and genotypic and phenotypic ratios for the offspring. [Since the results are all basically the same for the five specific matings give, you are confident that the genotypes of all of these 10 blue fishes are the same. And the Punnett Squares should all be the same for these five matings]
Oh boy that was a lot to type out =/
I've got pretty much all of the other problems down, but this one is just too confusing (probably because it's a long question).
3. You are a breeder of a type of aquarium fish you sell to pet stores. This species is colored red, and you raise thousands of these fishes. One day, you find that there is a mutant blue fish in the tank, and you wish to find out the genetics of this color. You raise this blue fish and mate it to a red fish (this is the first mating). This couple produces 120 eggs which hatch into babies that grow up into 58 blue fish and 62 red fish. You then take some of these 58 blue fish and mate them together; of the five such blue X blue matings, you get the following results (by brood): (1) 90 blue and 29 red, (2) 85 blue and 28 red, (3) 83 blue and 27 red, (4) 91 blue and 30 red, and (5) 92 blue and 31 red. When you mate any of the 62 red fishes together from the first mating, you always get all red offspring. In fact, no matter where the red fishes come from, when you mate any two red fishes together, you always get only red offspring. You take some of the blue fishes from the brood of 90 blue and 29 red fishes and you mate some of the blue fishes together. You find that some of these matings of blue X blue produces a brood of all blue fishes but many of the other blue X blue matings do not produce this kind of result (producing instead a mixture of red and blue fishes, with blue fishes being more common than red fishes). What is the simplest explanation for these results?
A. Give the pattern of inheritance for blue and red color in this species of fish.
B. Give the genotypes for the original blue and red fish (that were first mated together).
C. Give the Punnett Square and the resulting expected genotypic and phenotypic ratios for the offspring of the first mating of blue and red fish.
D. Consider the second group of matings, where you took some of the 58 blue fishes and mated them together. Give the mating (genotypes of the mated fish) and resulting Punnett Square and genotypic and phenotypic ratios for the offspring. [Since the results are all basically the same for the five specific matings give, you are confident that the genotypes of all of these 10 blue fishes are the same. And the Punnett Squares should all be the same for these five matings]
Oh boy that was a lot to type out =/
Comment