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12th Class Biology Principle Of Inheritance And Variation Question Bank MCQs - Principles of Inheritance and Variation

  • question_answer
    In a certain taxon of insects, some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosomes bearing organisms are

    A) males and females, respectively

    B) females and males, respectively

    C) all males

    D) all females

    Correct Answer: A

    Solution :

    [a] The 17 and 18 chromosomes bearing organisms are males and females, respectively. In large number of insects like cockroach and grasshopper, XX-XO type of sex-determination is seen, which shows male heterogamety. Here XX represent females and XO (which is basically single X chromosome) represents males. Therefore consequently the number of chromosomes in them would be 17 in males and 18 in females.


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