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. 
15. Why the ovum puts forth the polar bodies. 
16. Why the mother-cell of the spermatozoa 
produces four spermatozoa. 
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