268 



BIOLOGY: GENERAL AND MEDICAL 



we think, comprehensible, namely, as has already been stated, 

 we can imagine that during the sojourn together of the parental 

 biophpres in the germ cells of the new individual, from the moment 

 of fusion of the parental germ plasms to give rise to that individual, 



&RM MOTHER CELL.QffBRI, COCYTES (HYBRID), 



giving rise to four giv ing rise ea ch to one Ovum , ty reduction, 



^ermatozoa. ^ 



Dominant. Jit/ b rid. fybrid. ftecessive. 



DO DR DR RH 



FIG. 106. Schema to illustrate Mendel's law regarding the second hybrid 

 generation as regards a single pair of features, as also to illustrate the effects of 

 reduction of the chromosomes in oogenesis and spermatogenesis. 



Each germ cell (first row) is originally provided with chromosomes of paternal 

 (black) and of maternal origin (white). The existence of the law demands that 

 in the process of reduction the ovum and the spermatozoon (second row) become 

 provided with chromosomes (and biophores) that are of either paternal or of 

 maternal descent, but not of both; although, as above noted, the biophores may 

 in their growth and development have attracted side chains formed primarily 

 by the opposed order of biophores, to the exclusion of those originally belonging 

 to them. (Adami.) 



up to the maturation of his or her germ cells, there is an interaction 

 and interchange between the side chains to whose presence is due 

 these contrasted features, and this of such a nature that the newly 

 developed biophores, descended, let us say, from the biophores 



