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  • PYQs (GS & Optional)
  • (b) Sex chromosomes and their evolution, sex determination in Drosophila and human.

    • Sex chromosomes and their evolution
      • What phenotypic ratio do you expect from the following crosses with reference to colour blindness in human beings?
      • The Genotype of the parent is as under: 2n + XhY × 2n + X0xh. Indicate the type of Gametes that will be formed, and character represented by their Offsprings. Also indicate whether the parents are carriers or free from disorder. Find out: (i) Percentage of carriers. (ii) Percentage of haemophilic sons and daughters. (iii) Percentage of normal offsprings. Why does haemophilia occur? Give the symptoms of haemophilia. How is haemophilia genetically inherited?
      • What are sex-linked and sex-limited characters? Explain by suitable examples their mode of transmission.
      • Modern theories of sex determination.
    • Sex determination in Drosophila
      • What is sex-determination? Give an account of genic balance theory of sex-determination in Drosophila with examples from abnormal karyotypes.
      • Explain the genic balance theory of sex determination in Drosophila.
      • What is the objective of courtship behaviour? Describe courtship in Drosophila and three-spined stickleback.
      • Describe the mechanism of sex determination in Drosophila.
      • Explain the hormonal regulation of sex determination in mammals.
      • How does sex determination take place in Drosophila? Add a note on genic balance theory.
      • Compare the sex-determining mechanism of Drosophila and Add a note on the genic balance theory.
    • Explain the mechanism of sex determination in human beings.
  1. PYQs and Practice Questions
  2. UPSC Optionals
  3. Zoology Optional
  4. Genetics
  5. (b) Sex chromosomes and their evolution, sex determination in Drosophila and human.
  6. Sex determination in human

Explain the mechanism of sex determination in human beings. (UPSC 2023, 15 Marks, )

मानव में लिंग निर्धारण की प्रक्रिया को समझाइए। (Explain the mechanism of sex determination in human beings.)
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