QUESTIONS 207 



studied in pairs. What did he do about keeping the pollen of 

 different plants separate ? Why was he so careful ? Which char- 

 acters were dominant ? Which were recessive ? Was every character 

 either dominant or recessive? For how many years did Mendel 

 carry on his investigations? When did he write his important 

 papers ? What did these papers tell ? What effect did the reading 

 of his papers have on his audience ? What happened to the papers 

 afterwards ? How long did they stay in the Briinn library ? When 

 did Mendel die ? What was he heard to say many times before he 

 died ? What happened sixteen years after his death ? What do 

 modern scientists think about Mendel and his work ? Which books 

 take Mendel and his laws into account ? In what way has his name 

 stamped the whole subject of inheritance ? State three of Mendel's 

 laws as given. Compare these laws with those given in the two pre- 

 vious chapters. How did Mendel discover his laws ? Do they apply 

 best to animals or to plants ? 



Chapter V 



In 1900 what did the National Association of British and Irish 

 Millers decide to do ? Who was chosen chief investigator ? Mention 

 some of the qualities of the different kinds of wheat he used. 

 Describe Professor Biffen's work with these varieties. What success 

 did he have ? Describe the two fields of corn that grew side by 

 side. What was it that made the difference in the yield of the two 

 fields ? What has Mr. Burbank done in corn raising ? What about 

 the value of his potatoes ? Mention other vegetables and fruit that 

 have been improved by using the laws of inheritance. What is the 

 boll weevil ? How does it damage the cotton crop ? What has been 

 done to save the cotton from this weevil ? Describe the difference 

 between the amaryllis of former times and the new one produced 

 by Mr. Burbank. Describe his work with the poppy. How large 

 a poppy blossom has he secured ? What can he do with poppy-seed 

 capsules ? How did he change the daisy ? What has he done to the 

 thorn-covered cactus ? What have breeders done in changing sheep? 

 For what is the Jersey cow famous ? Mention other kinds of cattle 

 and the special quality for which they are bred. What does all this 

 show about the modern evolution of plants and animals ? 



