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

  • question_answer
    The condition in which females lack one sex chromosome whereas males are homogametic, the sex chromosomal representation is

    A) ZO-ZZ

    B) XY-XX 

    C) XX-XO             

    D) ZW-ZZ

    Correct Answer: A

    Solution :

    [a] ZO and ZZ type of sex-determination mechanism occurs in certain butterflies and moths. The female is heterogametic and produces two types of eggs, half with Z and half without Z-chromosome. The males are homogametic and forms only one kind of sperms, each with Z-chromosome.


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