In 1909 cytologist Frans Janssens described microscopic chromosomal structures t

Question

In 1909 cytologist Frans Janssens described microscopic chromosomal structures that were viewed during prophase I of ___; he called these structures ___ The structures Janssens saw seemed to represent regions in which ___ chromatids of ____ crossed over each other. Thomas Hunt Morgan suggested in 1916 that chiasmata were sites of chromosome breakage and exchange that resulted in ___. In the 1930s publication of studies by Curt Stem in Drosophila and by Harriet Creighton and Barbara McClintock in com showed that recombination is associated with actual ___ between chromosomes. The studies of Stem Creighton and McClintock utilized a combination of ___ that could be viewed in the microscope and ___ controlled by alleles known to reside on the same chromosome. In recombinant organisms ___ indicating that physical exchange had occurred

Explanation / Answer

1. Meiosis, Chiasmata

2. Non sister, homologous chromosomes

3. Genetic recombination

4. Physical exchange of parts

5. traits, genetic markers

6. physical markers were inherited with genetic markers

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