II. Co-dominance In a certain fish, blue scales (BB) and red scales (RR) are codominant. When a fish has the hybrid genotype, it has a patchwork of blue and red scales.
a. What is the genotype for blue fish? For red fish?
b. What is the genotype for patchwork (hybrid) fish?
c. What happens if you breed a patchwork fish with a fish that only has Blue Scales? (Do the Punnett Square) d. What is the probability of having fish with red scales? With patchwork scales? e. Two patchwork fish are crossed. What is the probability that they will have patchwork fish? (Do the Punnett Square)
a. What is the genotype for blue fish? For red fish?
b. What is the genotype for patchwork (hybrid) fish?
c. What happens if you breed a patchwork fish with a fish that only has Blue Scales? (Do the Punnett Square) d. What is the probability of having fish with red scales? With patchwork scales? e. Two patchwork fish are crossed. What is the probability that they will have patchwork fish? (Do the Punnett Square)
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a. The genotype for blue fish is BB, indicating that both alleles for scale color are blue. The genotype for red fish is RR, indicating that both alleles for scale color are red.
b. The genotype for the patchwork (hybrid) fish is BR, indicating that it carries one allele for blue scales and one allele for red scales.
c. When a patchwork fish (BR) is bred with a fish that only has blue scales (BB), the Punnett square would look like:
| B | B |
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B | BB | BB |
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R | BR | BR |
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In this case, all the offspring will have the genotype BR, resulting in patchwork scales.
d. When a patchwork fish (BR) is bred with a fish that only has blue scales (BB), the probability of having fish with red scales (RR) is 0%, as there are no red alleles present in the blue fish. The probability of having fish with patchwork scales (BR) is 100%, as all the offspring will inherit one blue allele (B) and one red allele (R).
e. When two patchwork fish (BR) are crossed, the Punnett square would look like:
| B | R |
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B | BB | BR |
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R | BR | RR |
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In this case, there is a 25% probability of having patchwork fish (BR), a 50% probability of having blue fish (BB), and a 25% probability of having red fish (RR)