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Principles of Inheritance and Variation

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Advanced Botany

Plant Growth and Development
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Ecosystem
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Environmental Issues
Microbes in Human Welfare
Strategies for Enhancement in Food Production
Molecular Basis of Inheritance
Principles of Inheritance and Variation
Sexual Reproduction in Flowering Plants
Reproduction in Organisms
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Respiration in Plants
Photosynthesis
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Transport in Plants
Cell Cycle and Cell Division
Cell-The Unit of Life
Anatomy of Flowering Plants
Morphology of Flowering Plants
Plant Kingdom
Biological Classification
  1. Which one of the following conditions correctly describes the manner of determining the sex in the given example?
    1. Homozygous sex chromosomes (ZZ) determine female sex in birds.
    2. XO type of sex chromosomes determine male sex in grasshopper
    3. XO condition in human as found in Turner syndrome, determines female sex.
    4. Homozygous sex chromosomes (XX) produce male in Drosophila.
Correct Option: B

In grasshopper the males lack a Y-sex chromosome and have only an X-chromosome. They produce sperm cells that contain either an X chromosome or no sex chromosome, which is designated as O.


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