206 THE NEXT GENERATION 



which shows color inheritance. Tell. which individuals in the illus- 

 tration are pure-bred, which hybrid. If we krfow the color of 

 Andalusian fowls, what can we always tell about their descendants ? 



CHAPTER III 



During the years from 1900 to 1905 what small animals were 

 receiving special study in the Zoological Laboratory of Harvard 

 University ? Why did Professor Castle keep them in this labora- 

 tory ? Why did he do his main work with guinea pigs ? In the case 

 of small animals why is it easy to trace resemblances between far- 

 away ancestors and present-day descendants ? How many genera- 

 tions do guinea pigs have each year ? Why does this give guinea 

 pigs an advantage as helpers in answering questions about inher- 

 itance ? Describe the guinea pig its size, color, coat, etc. What 

 did Dr. Castle learn about the way these characters are handed 

 on from ancestor to descendant ? Are the laws of inheritance the 

 same with guinea pigs as with Andalusian fowls ? At first sight, do 

 they seem to be the same or different ? When black guinea pigs 

 were mated with albino white, what was the color of their children ? 

 How do we know that all the black guinea-pig children were hybrid 

 and not pure-bred ? Why were these hybrids black and not blue ? 

 Describe the illustration. What do we mean when we say that 

 black is dominant and white recessive ? Which color is dominant 

 with Andalusian fowls ? Besides color, what other characters move 

 along by definite laws ? With guinea pigs, which is dominant, rough 

 coat or smooth coat ? long hair or short hair ? By knowing the laws, 

 how can one secure the desired kinds of descendants ? Why are 

 human beings interested in the laws of life ? In what way is each 

 person a bundle of combined characters ? What did Dr. Forel dis- 

 cover about his own face ? How does he explain the children of 

 many a distinguished man? 



CHAPTER IV 



Who was Mendel ? What did he do in the gardens of the cloister 

 at Briinn ? How many different kinds of peas did he raise ? For 

 what was he searching ? Mention some of the characters which he 



