PROBLEM 159 



181 



flowers in this experiment? Why such care in the transfer of 

 pollen ? What ought to happen after the transfer of the pollen ? 



Conclusion. — 1. Remembering that the egjg cell from one flower 

 has united with the sperm cell of another flower, if the operation 

 has been successful, what characters ought the new plant to have ? 

 Explain.. 



2. What is the use of hybridization? 



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Problem 158 : Other methods used in plant breeding. 



Materials. — Examples of budding, grafting, layers, and slips. 

 Charts and texts. 



Observations. — Notice carefully what has been done in making 

 a tongue graft, a cleft graft. Study the steps in budding (page 256, 

 Civic Biology). Consult any 

 good book on agriculture to see 

 how layering and slipping are 

 done. 



Conclusion. — 1. How might 

 these processes enable man (a) 

 to form new kinds of plants? 

 (6) to reproduce useful plants 

 (see page 255, Civic Biology) ? 



2. What kind of reproduc- 

 tion is this called, sexual or 

 asexual? Explain your answer 

 in a weU-written paragraph. 



Problem 159 : To determine 

 the working of Mendel's Laiq. 



Materials. — Text illustra- 

 tions, charts, material illustrating 

 Mendel's Law. 



Observations. — Study the il- 

 lustrations very carefully. No- 

 tice that there are three possi- 

 bilities of offspring : those having 

 dominant, recessive, and mixed 



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Diagram to Illustrate Mendel's Law. 

 White Dominant, Black Recessive, 

 Character. 



A, first generation ; B, second genera- 

 tion ; C, third generation. 



