9:7 ratio

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Mind Map on 9:7 ratio, created by Cora B. on 09/02/2018.
Cora B.
Mind Map by Cora B., updated more than 1 year ago
Cora B.
Created by Cora B. about 6 years ago
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9:7 ratio
  1. Carefully explain how two white snails can be crossed to (a) produce pigmented offspring, and (b), a 9:7 ratio of pigmented:white grand-offspring
    1. Albinism in the common freshwater snails can result from the presence of two recessive alleles at either of two different loci.
      1. The 9:7 ratio seen in the F2 snails can be understood as a modification of the 9:3:3:1 ratio obtained when two individuals heterozygous for two different loci are crossed.
        1. The 9:7 ratio arises when dominant alleles at both loci (A_B_) produce pigmented snails; any other genotype produces albino snails.
          1. The 9:7 ratio in these snails is probably produced by a two-step pathway of pigment production
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