Home
Class 12
BIOLOGY
Comment on Trisomy-21...

Comment on Trisomy-21

Text Solution

Verified by Experts

Trisomic condition of chromosome - 21 results in Down.s syndrome. It is characterized by severe mental retardation, defective development of the central nervous system, increased separation between the eyes, flattened nose, ears are malformed, mouth is constantly open and the tongue protrudes.
Promotional Banner

Topper's Solved these Questions

  • PRINCIPLES OF INHERITANCE AND VARIATION

    FULL MARKS|Exercise Additional Questions 5 Mark Question|2 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATION

    FULL MARKS|Exercise Additional Questions 5Mark Question|1 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATION

    FULL MARKS|Exercise Additional Questions 1 Mark Question|22 Videos

  • PLANT TISSUE CULTURE

    FULL MARKS|Exercise HOTS|4 Videos

  • PRINCIPLES AND PROCESSES OF BIOTECHNOLOGY

    FULL MARKS|Exercise Higher Order Thinking Skills (HOTs) Questions|4 Videos

Similar Questions

Explore conceptually related problems

Comment on Agar.

Comment on cybrid.

Pick out the correct statement. (i) Karyotyping helps in gender identification (ii) Holandric genes are located on X- chromosome (iii) Trisomy- 21 is an allosomal abnormality (iii) Cooley's anaemia is an autosomal recessive disorder

Comment on SCID.

Comment on Biosafety.

Comment on Biosafety.

Comment on Azolla.

Comment on Amensalism.

Comment on restriction point.

FULL MARKS-PRINCIPLES OF INHERITANCE AND VARIATION -Additional Questions 2 Mark Question
  1. Complete the equation. (a) " Phenylalanine " overset (A) to " Tyrosi...

    Text Solution

    |

  2. Write a note on Huntington's chorea .

    Text Solution

    |

  3. Comment on Trisomy-21

    Text Solution

    |

  4. Mention the genetic makeup of Turner's syndrome person and Klinerfelte...

    Text Solution

    |

  5. List out any four clinical symptoms of Kilnefelter's syndrome.

    Text Solution

    |

  6. Write the types of sex- determination mechanisms does the following cr...

    Text Solution

    |

  7. What are they enzymes encoded by the alleles

    Text Solution

    |

  8. Draw a tabular column representing various types of blood group in hum...

    Text Solution

    |

  9. Give an account on Rhesus factor.

    Text Solution

    |

  10. How Erythroblastosis fetalis can be prevented ?

    Text Solution

    |

  11. Explain XX-XO type of sex determination.

    Text Solution

    |

  12. Name the type of sex-determination mechanism of the following organism...

    Text Solution

    |

  13. Complete the following cross. underset ("female")"AA ZW" xxunderset ...

    Text Solution

    |

  14. Role of Y-chromosome is crucial for maleness - Justify.

    Text Solution

    |

  15. (a) Explain the statement that color blindness is perfect example for ...

    Text Solution

    |

  16. How the Karyotype of Iymphocytes was prepared by Tjio and Levan? Edit...

    Text Solution

    |

  17. What is a genetic disorder? Mention its types?

    Text Solution

    |

  18. Explain the genetic basis of Phenylketonuria.

    Text Solution

    |

  19. Give an account on Patau's syndrome.

    Text Solution

    |

  20. Differentiate Aneuploidy and Euploidy.

    Text Solution

    |