Heredity in Protozoa 



parent (Figure 13, C) ; at the same time they transform in 

 various ways, till they have produced anew a set of organs 

 like those of the parent, of the same number, form, size and 

 arrangement. 



B 



Figure 13. Reproduction in Stylonychia, after Wallengren (1901). 

 A, Parent before reproduction. B, Appearance of the two groups of 

 small projections that are to form the appendages of the two offspring. 

 C, Division is occurring; the two groups of embryonic appendages are 

 scattering out to take up their final positions. The old appendages 

 have not yet disappeared. 



All this illustrates the general nature of the problem of 

 heredity in both lower and higher organisms ; the features 

 which the offspring are said to inherit from the parents they 

 really produce anew for themselves, and the problem is as to 

 why and to what extent they produce the same things that 

 the parents did. 



There are certain exceptions to this general rule that the 

 progeny have to produce anew what they inherit; a few 



