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. W^hat 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 ? 



