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NEET Biology Biotechnology And Its Applications Question Bank Genetic Variation

  • question_answer
    Frequency of Down's syndrome increases when the maternal age is [Orissa JEE 2004]

    A) Above 35 years

    B) Below 35 years

    C) During 1st pregnancy

    D) In mothers of at least 3 children

    Correct Answer: A

    Solution :

    They occur in 1/700 births in women aged 25 years or under. The frequency increases with age to about 1/100 for women of age 40 and 1/10 for women of age 45.


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