Phenomena of Inheritance 



2. Why they differ from their parents. 



3. Why the members of a family display indi- 

 vidual differences. 



4. Why the members of a family tend to 

 resemble one another more closely than they 

 resemble individuals belonging to other families. 



5. Why " sports " sometimes occur. 



6. Why some species are more variable than 

 others. 



7. Why certain variations tend to occur very 

 frequently. 



8. Why variations in some directions seem 

 never to occur. 



9. Why a female may produce offspring when 

 paired with one male of her species and not when 

 paired with another male of the species. 



10. Why organisms that arise by partheno- 

 genesis appear to be as variable as those which 

 are sexually produced. 



11. Why certain animals possess the power of 

 regenerating lost parts, while others have not 

 this power. 



12. Why most plants and some of the lower 

 animals can be produced asexually from cuttings. 



13. Why mutilations are not inherited. 



14. Why acquired characters are rarely, if 

 ever, inherited. 



1 5. Why the ovum puts forth the polar bodies. 



1 6. Why the mother-cell of the spermatozoa 

 produces four spermatozoa. 



