Imagine that you went to the pet store and bought two black guinea pigs that are known to be heterozygoues (Bb). You also kno whtat black fur (BB) is dominant over white fur (bb), and a 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 only produce only black progeny. a) How would you explain this resultb) what is the probability of your two black guinea pigs producing white offspring? c) If an average mating produces 10 offspring, how many matings would it take to produce a white offspring?

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Asked Jan 26, 2020
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Imagine that you went to the pet store and bought two black guinea pigs that are known to be heterozygoues (Bb). You also kno whtat black fur (BB) is dominant over white fur (bb), and a 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 only produce only black progeny. 

a) How would you explain this result

b) what is the probability of your two black guinea pigs producing white offspring? 

c) If an average mating produces 10 offspring, how many matings would it take to produce a white offspring?

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Expert Answer

Step 1
  • The genotype of the black guinea pigs is Bb. The black fur allele B is dominant over the white fur allele b.
  • In the Punnett square it can be observed that three progenies have black fur. One progeny has the genotype bb that should be white but it dies due to its linkage with the recessive lethal allele a. The lethal allele a is closely situated with the allele b responsible for white fur. Therefore, the recessive bb offspring would be homozygous recessive for the lethal allele a. The lethal allele a is recessive and in a homozygous condition causes the death of the individual carrying it.
Biology homework question answer, step 1, image 1
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Step 2

The recombination between white fur allele b and recessive lethal allele a would lead to the disassociation of white fur allele b from the recessive lethal allele. This means that genes a and b will not be transmitted together into the progeny and bb genotype progeny (white fur) will not die. The distanc...

Biology homework question answer, step 2, image 1
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