Home
Class 12
BIOLOGY
Frequency of Down's syndrome increase wh...

Frequency of Down's syndrome increase when the matermal age is

A

Above 35 years

B

Below 35 years

C

During 1st pregnancy

D

In mothers of at least 3 children

Text Solution

Verified by Experts

The correct Answer is:
A
They occure im 1/700 births in women aged 25 years or under. The frequncey increase with age to about 1/100 for women of age 40 and 1/10 for women of age 45.
Promotional Banner

Topper's Solved these Questions

  • MOLECULAR BASIS OF INHERITANCE

    ERRORLESS |Exercise Molecular Basis Of Inheritance|469 Videos

  • REPRODUCTION IN ORGANISMS

    ERRORLESS |Exercise Reproduction In Organisms|116 Videos

Similar Questions

Explore conceptually related problems

Frequency of Down syndrome increases when the maternal age is :

Frequency of Down syndrome increases when maternal age is above 35 years. In aged mother nondisjunction of 21st chromosome during oogenesis occurs more frequently.

Down's syndrome is due to

Down's syndrome is due to

Down 's syndrome is due to

Down's syndrome is related to

Frequency of a character increase when it is

Down's syndrome is an example

Down syndrome is due to :

ERRORLESS -PRINCIPLES OF INHERITANCE AND VARIATION-Principles Of Inheritance And Variation
  1. In the given human hand pedigree which character is represented and wh...

    Text Solution

    |

  2. A recessive mutant is one which is:

    Text Solution

    |

  3. Frequency of Down's syndrome increase when the matermal age is

    Text Solution

    |

  4. Addition or deletion of a single nucleotide results in which type of m...

    Text Solution

    |

  5. Change in the number of body parts is called

    Text Solution

    |

  6. Turner's syndrome is an example of

    Text Solution

    |

  7. In man, which of the following genotypes and phenotypes may be the cor...

    Text Solution

    |

  8. The "cri-du-chat" syndrome is caused by change in chromosome structure...

    Text Solution

    |

  9. Somaclonal variation appears in plants

    Text Solution

    |

  10. Mutation cannot charge

    Text Solution

    |

  11. Turner's syndrome in human caused by

    Text Solution

    |

  12. Which of the following corresponds to mutagens

    Text Solution

    |

  13. Both sicke cell anaemia and Huntington's chorea are

    Text Solution

    |

  14. Albinism is known to be due to an autosomal recessive mutation. The fi...

    Text Solution

    |

  15. Failure of segregation of chromatids during cell division results in t...

    Text Solution

    |

  16. Addition of one or more haploid set of its own genome in an organism r...

    Text Solution

    |

  17. Autosomal mutant allele HbS causes

    Text Solution

    |

  18. Due to the nondisjunctiuon of chromosomes during spermatogenesis, sper...

    Text Solution

    |

  19. Genteic variation in a population arises due to

    Text Solution

    |

  20. The chromosomal condition in Turner's syndrome is or A human female ...

    Text Solution

    |