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5. A black guinea pig crossed with an albino guinea pig produces 12 black offspring. When the albino is crossed with a second black one, 7 blacks and 5 albinos are obtained. 
a) What is the best explanation for these observations (i.e. what is the mode of inheritance)? 
b) Given your answer for a)... 
* What is the genotype of the first black guinea pig?  
* What is/are the genotype(s) of the gametes produced by this black guinea pig?  
* What is the genotype of the albino?  
* What is/are the genotype(s) of the gametes produced by this albino?  
* What is/are the genotype(s) of the offspring from this cross?  
* What is the genotype of the second black guinea pig?

6. A rooster with grey feathers is mated with a hen of the same phenotype. Among their offspring, 15 chicks are gray, 6 are black, and 8 are white. 
a) What is the mode of inheritance for feather colors in chickens? 
b) What phenotypic ratio would you predict in the offspring from the mating of a gray rooster and a black hen?

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