You just bought two black guinea pigs from the pet store that are known to be he

Question

You just bought two 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 one cM 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 with these same parents before you’d expect to see a white guinea pig?


c. Indicate the most likely genotype of the white offspring.

Explanation / Answer

"a. How would you explain this result?" This is probably because while crossing over takes place, the recessive allele can be thought as linked to bb and when a white progeny is formed, as a linked gene, this recessive allele is also expressed. Therefore, white ones die. c. (bb, {lethal allele}{lethal allele})

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