Which of the following statements are correct?

  • A
    Morgan united knowledge of chromosomal segregation with Mendelian principles
  • B
    Thomas Hunt Morgan worked with Drosophila melanogaster to experimentally verify the chromosomal theory of inheritance
  • C
    $A$ single mating of Drosophila melanogaster could produce a small number of progeny flies
  • D
    There was no clear differentiation of sexes in Drosophila melanogaster

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