genetic cross ratios

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Last updated 8:16 PM on 4/23/26
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6 Terms

1
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monohybrid cross

3 : 1 (dominant : recessive)

2
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dihybrid cross

9 : 3 : 3 : 1

  • 9 = both dominant traits

  • 3 = dominant/recessive mix

  • 3 = recessive/dominant

  • 1 = double recessive

3
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Recessive epistasis

9 : 3 : 4

  • One recessive genotype masks another gene

9 = wild type, 3 = one mutant phenotype, 4 = the other phenotype

4
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dominant epistasis

  • 12 : 3 : 1

  • One dominant allele masks another gene

5
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complementary

  • 9 : 7

  • Two genes must BOTH be functional to show trait

6
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Lethal alleles

2 : 1 (instead of 3:1)