16G 



PROTOZOOLOGY 



ciliate, conjugate and the exconjugants are allowed to reproduce 

 by fission, the descendants will show a greater variation among 

 them with respect to the dimensions, fission-rate, etc. Thus 

 several new biotypes may appear. If conjugation takes place 

 between individuals of different clones and the descendants of 



Fig. 82. Hybridization in Chlamydomonas (Pascher). a, vegetative 

 individual of Chlamydomonas I; b, that of II; c, sexual fusion of two 

 gametes of I; d, that of two gametes of II; e, homozygote of I; f, 

 homozygote of II; g, sexual fusion of a gamete of I with a gamete of 

 II; h, i, heterozygotes between I and II; j-m, four types of individuals 

 arising from a heterozygote in culture. 



this pair in turn conjugate and multiply by fission, the progeny 

 will show conditions comparable to those which one sees in 

 Mendehan inheritance in higher animals. In nature and in mass 

 culture, it is supposed that this process is taking place con- 

 tinuously. 



Since various species of Protozoa commonly co-inhabit small 

 confines of water in nature, it is probable that hybridization be- 

 tween varieties or species may occur. Information on hand on 



