You are studying three traits in a goldfish variety; body colour (A or a), tail length (B or b) and shape (C or c). Note: Use the uppercase letters for the alleles associated with the dominant phenotypes and the lowercase letters for the alleles associated with the recessive phenotypes. Assume that each of these traits is regulated by one gene. Photo credit https://www.petmd.com Part A. You mate a gold fish (P1) with a white fish (P2) and obtain 100 fish in F1, of which 50 are gold and 50 are white. Write two sets of the possible genotypes of the parental and the resulting F1 fish by filling in the table below. Sets P1 P2 F1 gold fish F1 white fish 1 2
You are studying three traits in a goldfish variety; body colour (A or a), tail length (B or b) and shape (C or c).
Note: Use the uppercase letters for the alleles associated with the dominant
Photo credit https://www.petmd.com
Part A. You mate a gold fish (P1) with a white fish (P2) and obtain 100 fish in F1, of which 50 are gold and 50 are white. Write two sets of the possible genotypes of the parental and the resulting F1 fish by filling in the table below.
|
Sets |
P1 |
P2 |
F1 gold fish |
F1 white fish |
|
1 |
|
|
|
|
|
2 |
|
|
|
|
Part B. You cross a true breeding gold fish having long curly tail (P3) with a true breeding gold fish having short and straight tail (P4). All of the resulting F1 fish have long straight tails.
- Write the genotype of the parental fish (P3 and P4) using the outlined nomenclature.
Genotype of P3: _____
Genotype of P4: _____
- You test cross an F1 fish (with genotype BbCc) and obtain 1000 offsprings in F2 generation with the following results: 474 Bbcc, 480 bbCc, 20 BbCc and 26 bbcc.
- Create and fill in a Punnet square for this cross.
- What type of cross is it?
- Are these loci linked?
- What are the two parental classes and the two recombinant classes of offspring?
- What is the percentage of recombination between these two loci? Show your calculations.
- How many map units apart are they?
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