EXERCISE 145 (Continued) 



Record. What is the proportion of dominant from both parents ? 



What is the proportion of recessive from both parents ? 



What is the proportion of dominant from father and recessive from mother ? 



What is the proportion of dominant from mother and recessive from father ? 



What proportion of the whole offspring is pure ? 



What proportion of the pure is dominant ? 



What proportion of the pure is recessive ? 



What proportion of the whole offspring is mixed, or hybrid ? 



What proportion of the hybrid is dominant ? 



What proportion of the hybrid is recessive ? 



What proportion of all is dominant? 



What proportion of the dominant is pure ? 



Questions. 1 . Why are recessives always pure ? 



2. Which characters are more valuable to a species, the dominant or the recessive ? 



3. What value would it be to know whether a given human trait is dominant or recessive ? 



4. How would you find out the chances for the appearance of any combination of characters where 

 there are two alternative pairs ? 



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