CHROMOSOMES AND MITOCHONDRIA 247 
completely with the egg nucleus and the two to- 
gether become incorporated in the first cleavage 
Fie. 61.— Independence of paternal and maternal chromatin in the 
segmenting eggs of Cyclops. <A. First cleavage-figure in C. strenuus; 
complete independence of paternal and maternal chromosomes. 
B. Resulting two-cell stage with double nuclei. C. Second cleavage ; 
chromosomes still in double groups. D. Blastomeres with double 
nuclei from the eight-cell stage of C. brevicornis. (From Wilson, 
after Haecker.) 
spindle. Each of the two nuclei furnishes an equal 
(haploid) number of chromosomes to the first 
