Appendix E 



443 



Phenotypes (2 W ) = 9 TH ; 3 Th; 3 tH ; 1 th. 

 Genotypes (3 W ) = 1 TTHH, 1 TThh, 1 tf##, 1 ttM, 2 

 2 tt#A, 2 Tthh, 2 7W#, and 4 TtHh. 



Problem 6. - 



Tall (Heter) 1 smooth (m) X dwarf, Hairy (tH). 

 Female gametes = Th, th. 

 Male gametes = tH. 



POLLEN GRAINS 

 tH 



EGG CELLS 



Th 



th 



TtHh 



ttHh 



It will be seen that two types are produced the first year after 

 crossing instead of the one where pure parents are used. Segre- 

 gation takes place immediately in the female parent because of 

 its hybridity, and two kinds of gametes will be produced. 



In order to get a comparison with the F z when pure parents 

 are crossed, it is necessary to self both types as follows : 



(a) TtHh produces gametes as follows, Th, Th, tH, th. These 

 are the same as in problem 5 and hence the resulting plants will 

 be:- 



Phenotypes = 9TH,3 Th, 3 tH, 1 th. 



Genotypes = 1 TTHH, I TThh, I ttHH, 1 tthh, 2 TTHh, 

 2 ttHh, 2 Tthh, 2 TtHH, and 4 TtHh. 



(6) ttHh produces the following gametes : tH, th. 



1 "Heter" is used for short in place of heterozygote, similarly " homo " 

 is used for homozygote. 



