Home
Class 12
BIOLOGY
Explain the sex-determination mechanism ...

Explain the sex-determination mechanism in humans. How is it different in birds?

Text Solution

Verified by Experts

Sex determination in humans-XY type. Out of 23 pairs, 22 pairs are exactly same in males and females (autosomes) 23rd pair is X-chromosomes in female and X, Y in males
Sex determination in birds. They have ZZ-ZW type of sex determination, i.e., females have ZW pair in addition to autosomes whereas males have ZZ sex chromosomes in addition to antosomes. They show female heterogamety i.e., .ZW in females and males are homogametic ZZ. So sex is determined by female which produces two dissimilar gametes with .Z. or .W chromosomes.
Promotional Banner

Topper's Solved these Questions

  • PRINCIPLES OF INHERITANCE AND VARIATION

    BETTER CHOICE PUBLICATION|Exercise LONG ANSWER TYPE QUESTIONS |31 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATION

    BETTER CHOICE PUBLICATION|Exercise LONG ANSWER TYPE QUESTIONS |31 Videos

  • PRINCIPLES AND PROCESSES IN BIOTECHNOLOGY

    BETTER CHOICE PUBLICATION|Exercise LONG ANSWER TYPE QUESTIONS|16 Videos

  • REPRODUCTION IN ORGANISMS

    BETTER CHOICE PUBLICATION|Exercise LONG ANSWER TYPE QUESTIONS (5 MARKS)|11 Videos

Similar Questions

Explore conceptually related problems

Explain the reactivity of SN^2 mechanism ?

Foetal sex determination test is known as

Explain the autoregulatory mechanism of GFR.

Explain the mechanism of sex determination in birds. How does it differ from that of human beings?

ZZ/ZW type fo sex determination is seen in:

Explain with example S_(N^1) mechanism.

Explain the process of heterosis. How is it different from inbreeding depression?

BETTER CHOICE PUBLICATION-PRINCIPLES OF INHERITANCE AND VARIATION -SHORT ANSWER TYPE QUESTIONS
  1. Write the significance of variations.

    Text Solution

    |

  2. Define Mendel’s law of segregation. Draw only Punnett’s square to expl...

    Text Solution

    |

  3. Define Mendel’s law of dominance. Draw only Punnett’s square to explai...

    Text Solution

    |

  4. A haemophilic man marries normal female.Withthe help of a Punnett squa...

    Text Solution

    |

  5. What is the cause of phenylketonuria? Write symptoms.

    Text Solution

    |

  6. Explain the sex-determination mechanism in humans. How is it different...

    Text Solution

    |

  7. Why are Grasshopper.and Drosophila said to show male heterogamety? Exp...

    Text Solution

    |

  8. Explain female heterogamety with the help of an example.

    Text Solution

    |

  9. Describe Mendelian disorders and mention its two types giving suitable...

    Text Solution

    |

  10. If a true breeding homozygous pea plant with green pod and axial flowe...

    Text Solution

    |

  11. If a true breeding homozygous pea plant with green pod and axial flowe...

    Text Solution

    |

  12. If a true breeding homozygous pea plant with green pod and axial flowe...

    Text Solution

    |

  13. Why is thalassaemia categorised as a Mendelian disorder ? Write the sy...

    Text Solution

    |

  14. A colour blind child is born to a normal couple. Work out a cross to s...

    Text Solution

    |

  15. What is Down's syndrome? Give its symptoms and cause. Why is it that t...

    Text Solution

    |

  16. List the differences between Turner's syndrome and Klenifelter's syndr...

    Text Solution

    |

  17. In the following pedigree chart, state if the trait is autosomal domin...

    Text Solution

    |

  18. This is the pedigree of a family movement of the gene for haemophilia....

    Text Solution

    |

  19. Haemophilia is a sex-linked recessive disorder of humans. The pedigree...

    Text Solution

    |

  20. Haemophilia is a sex-linked recessive disorder of humans. The pedigree...

    Text Solution

    |