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Wednesday, September 30, 2020

Chromosomal Basis of Inheritance - CSIR NET

Chromosomal Basis of Inheritance

In 1902, Walter S. Sutton and T. Boveri proposed the chromosomal theory of heredity.

  • The theory provides a way to explain how cellular transmission or chromosomes passes genetic determinant (i.e. genes) from parent to offspring.

According to this view:

  • Chromosomes are replicated & passed along generation after generation from parent to offspring.
  • One member of each pair segregates into one daughter nucleus & the other segregates into different daughter nucleus. Therefore, gametes contain one set of chromosomes (i.e. they are haploid).
  • During gamete formation, different types of chromosomes segregate independently of each other.
  • Each parent contributes one set of chromosomes to its offspring. Hence, the chromosome theory of inheritance describes the relationship between Mendel's Law & chromosomal transmission.
Fig: Segregation of homologous chromosome during meiosis explains Mendel's law of segregation



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