10th Class Science Heredity and Evolution

  • question_answer 65)
      A woman has only daughters. Analyze the situation genetically and provide a suitable explanation.

    Answer:

                      The sex of a child depends on the type of male gamete (sperm) as the man produces sperms with either X or Y-chromosome. If a sperm carrying X-chromosome fertilizes the ovum (female gamete with X-chromosome), then the child born will be a girl. This is because the child will have XX pair of sex chromosome. A woman has only daughters. This indicates that in every fusion, the sperm carrying X-chromosome fertilized the ovum.


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