GCSE Biology (AQA)

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Gene Theory

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Inheritance, Variation and Evolution The Development of Understanding of Gentics and Evolution

Gene Theory

2:35 Understanding Genetics
Spec 4.6.3.3
Previous Gregor Mendel Next Evidence for Evolution
  • Gene theory posits that characteristics are passed to offspring through units called genes.
  • Genes are located on chromosomes within the cell nucleus.
  • Gene theory evolved from the work of many scientists, primarily after Mendel's death in the late 19th century.
  • Observations of chromosomes during cell division post-Mendel helped understand the science behind his observations.
  • The 23 pairs of chromosomes in human cells (except gametes) were crucial in developing gene theory.
  • Early 20th-century observations showed that chromosomes and Mendel's units behaved similarly, confirming genes are on chromosomes.
  • Mid 20th-century discoveries included the structure of DNA, identified by Watson and Crick with contributions from Rosalind Franklin and Morris Wilkins.
  • For exams, focus on the role of Mendel and the general development of gene theory rather than specific contributing scientists.

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