12178760
9:7 ratio
- 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
- Albinism in the common freshwater snails can
result from the presence of two recessive alleles at
either of two different loci.
- 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.
- The 9:7 ratio arises when dominant
alleles at both loci (A_B_) produce
pigmented snails; any other genotype produces albino snails.
- The 9:7 ratio in these snails is probably produced by a
two-step pathway of pigment production
- The 9:7 ratio in these snails is probably produced by a
two-step pathway of pigment production
- The 9:7 ratio arises when dominant
alleles at both loci (A_B_) produce
pigmented snails; any other genotype produces albino snails.
- 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.
- Albinism in the common freshwater snails can
result from the presence of two recessive alleles at
either of two different loci.
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