38 



Plant Genetics 



Fig. 5 shows that we are dealing with two homo- 

 zygotes, each producing only one kind of gamete, so 

 that all the hybrid progeny will be similar, both geno- 



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Tall Smooth Paient 



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Dwarf WiinUed 

 Parenl 



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F, H^ 



Ganwta 



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W5 



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WS 



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Fig. S- — Diagram illustrating dihybrid ratio. Upper part shows 

 how original parents were crossed to give F, hybrid; lower part shows 

 Fi hybrid producing four kinds of gametes; chance matings among these 

 gametes, when Fi is inbred, results as indicated in the large set of squares 

 and explains the 9:3:3: i ratio in the F, generation. 



