Write the main provisions of the chromosome theory of heredity T. Morgan.

• The gene is a chromosome site.
• Allelic genes (genes responsible for one trait) are located in strictly defined places (loci) of homologous chromosomes.
• Genes are located linearly on the chromosomes, that is, one after another.
• In the process of formation of gametes between homologous chromosomes, conjugation occurs, as a result of which they can exchange allelic genes, that is, crossing-over can occur.

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