student whose hobby is fishing pulled a carp out of Cayuga Lake that was very unusual: it had no scales on its body. She decided to investigate whether this strange “nude” phenotype had a genetic basis. She obtained some inbred carp that were pure-breeding for the wild-type scale pattern in which the fish had scales covering their body. She crosses these wild-type fish with her nude fish. To her surprise, the F1 progeny were wild-type fish and fish with a single, linear row of scales on the sides of their body (i.e. “linear). The ratio of these progeny was 2:1. She then crosses some of her F1 fish and obtains four phenotypes: wildtype, linear, nude and a new
A student whose hobby is fishing pulled a carp out of Cayuga Lake that was very unusual: it had no scales on its body.
She decided to investigate whether this strange “nude” phenotype had a genetic basis. She obtained some inbred carp that were pure-breeding for the wild-type scale pattern in which the fish had scales covering their body.
She crosses these wild-type fish with her nude fish. To her surprise, the F1 progeny were wild-type fish and fish with a single, linear row of scales on the sides of their body (i.e. “linear). The ratio of these progeny was 2:1.
She then crosses some of her F1 fish and obtains four
In the space below - answer the following questions: (use the letters S/s for scale production and L/l for scale pattern)
- How many genes are involved in producing scales on these fish? - answer: _______________________________
- What is going on genetically that explains all of these results?
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