INTRODUCTION
 

The topic # 6. Theodor Boveri (1862-1915).

I need in 4 references (see below) for these descriptions:

1888 Theodor Boveri (1862-1915) (reference ?) verifies August Weismann's (1885, reference ?) predictions of chromosome reduction by direct observation in Ascaris.

1890 The numerical equality of paternal and maternal chromosomes at fertilization was established by Theodor Boveri (1862-1915) (reference ?) in Germany and Jean-Louis-Lon Guignard
 (full name? YYYY-YYYY ?) in France.

1902 Theodor Boveri (1862-1915) (reference ?) studies sea urchin embryos and finds that in order to develop normally, the organism must have a full set of chromosomes, and from this he concludes that the individual chromosomes must carry different essential hereditary determinants.

1905 Theodor Boveri (1862-1915) called the nucleus of the spermatozoon or egg a Hemikaryon; the fusion-nucleus of a zygote an Amphikaryon; and a nucleus in which the number of chromosomes had doubled without nuclear division a Diplokaryon. Eduard Adolf Strasburger (1844-1912) was using the words diploid and haploid in 1907 and tetraploid, oktaploid, and polyploidy in 1910.

Reference
Boveri T, 1905. Zellen-Studien. Heft 5. Ueber die Abhangigkeit der Kerngrosse und Zellenzahl der Seeigel-Larven von der Chromosomenzahl der Ausgangszellen. Jena (Fischer).

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