A hypothetical brown frog with black spots (genotype BbSs) is test crossed with a green, unspotted frog (genotype bbss).  These produce the following progeny: brown + spotted: 64 brown + unspotted: 134 green + spotted: 130 green + unspotted: 72 a. What is the genotype of the original dihybrid frog?  Specify which alleles are on each chromosome of the brown frog with black spots (i.e. AB/ab or Ab/aB). b. How many map units separate the colour and spot genes? Show your calculations.

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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A hypothetical brown frog with black spots (genotype BbSs) is test crossed with a green, unspotted frog (genotype bbss).  These produce the following progeny:

  • brown + spotted: 64
  • brown + unspotted: 134
  • green + spotted: 130
  • green + unspotted: 72

a. What is the genotype of the original dihybrid frog?  Specify which alleles are on each chromosome of the brown frog with black spots (i.e. AB/ab or Ab/aB).

b. How many map units separate the colour and spot genes? Show your calculations.

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