Indicate the most likely genotype of the white offspring


Ttwo black guinea pigs from the pet store that are known to be heterozygous (Bb). You also know that black fur (BB) is dominant over white fur (bb), and that a lethal recessive allele is located only 1 cM (1 centimorgan) away from the recessive b allele. You decide to start raising your own guinea pigs, but after mating these animals several times, you discover they produce only black progeny.
a. How would you explain this result?
b. If the original black guinea pigs produce an average of 10 offspring per mating, how many matings would you have to make before you'd expect to see a white guinea pig? 
c. Indicate the most likely genotype of the white offspring.
How would I explain this? I'm completely lost. 

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Biology: Indicate the most likely genotype of the white offspring
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