1. Tardigrade
  2. Question
  3. Biology
  4. The normal body colour of a grasshopper is green. The gene for this character is present on X chromosome. Due to recessive mutation in this gene, grasshoppers with pink body colour are produced. A male grasshopper with green body colour mates with a female grasshopper with pink body colour. Which of these statements is true?

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Q. The normal body colour of a grasshopper is green. The gene for this character is present on X chromosome. Due to recessive mutation in this gene, grasshoppers with pink body colour are produced. A male grasshopper with green body colour mates with a female grasshopper with pink body colour. Which of these statements is true?

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

Grasshoppers show $XX-XO$ type of inheritance. Female grasshoppers have two $X$ chromosomes and male grasshoppers have one X chromosome. Let the chromosome with the recessive mutation producing pink body colour is Xp. Female grasshoppers with pink body colour will have XpXp. Male grass hopper will have one $X$ . In the cross between XpXp and XO, only two phenotypes will be produced: XXp carrier females who will be green and XpO pink body males.