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Principles of Inheritance and Variation

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Advanced Botany

Plant Growth and Development
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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
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Cell-The Unit of Life
Anatomy of Flowering Plants
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Plant Kingdom
Biological Classification
  1. A mother in a family of five daughters is expecting her sixth baby. The chance of its being a son is
    1. zero
    2. 25%
    3. 50%
    4. 100%
Correct Option: C

Humans have 22 pairs of autosomes and 1 pair of sex chromosomes which are XX in females and XY in males. So, everytime the chances of son or daughter is 50-50% depending upon which sex chromosome is contributed by father in sperm.


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