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Question
The leaf colour of certain plants is controlled by one gene. For that gene, the allele G = orange and g = green. You have a plant with orange leaves, but do not know whether that plant’s genotype is GG or Gg.
If you cross your unknown plant with one of the plants whose genotype is listed below, you will be able to determine your unknown’s genotype. With which plant would you cross it?
The leaf colour of certain plants is controlled by one gene. For that gene, the allele G = orange and g = green. You have a plant with orange leaves, but do not know whether that plant’s genotype is GG or Gg.
If you cross your unknown plant with one of the plants whose genotype is listed below, you will be able to determine your unknown’s genotype. With which plant would you cross it?
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Solution
The correct option is C gg
To know the genotype of dominant phenotype, we will cross that plant with the respective recessive phenotype. This is called test cross. Such cross can easily be analyzed to predict the genotype of the test organism. In this case, the recessive plant will have gg. Thus, a cross between gg and the test plant will help to determine the genotype.
To know the genotype of dominant phenotype, we will cross that plant with the respective recessive phenotype. This is called test cross. Such cross can easily be analyzed to predict the genotype of the test organism. In this case, the recessive plant will have gg. Thus, a cross between gg and the test plant will help to determine the genotype.
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