Question

Coat color in rodents is known to be a trait resulting from gene interactions (gene modifier...

Coat color in rodents is known to be a trait resulting from gene interactions (gene modifier effect). The two genes involved are A and C. Allele C results in black pigmentation and is dominant to c (albino). Allele A results in the agouti phenotype if the rodent carries at least one dominant C allele. One albino rodent from unknown genotype mates an agouti rodent that is known to be homozygous dominant for both genes. The offspring resulting from that mating could be:

Select one:

a. Only agouti

b. A combination of black, agouti and albino

c. Impossible to determine if the genotype of the albino rodent is unknown.

d. Only black

e. Only albino

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Answer #1

a) Only agouti
Explanation: According to the question, The possible genotypes for Albino can be :AAcc , Aacc and aacc
The genotype of agouti used for cross - AACC
Therefore
case1: Cross between : Aacc * AACC
Offsprings produced - AACc , AaCc , AACc,AaCc
Case 2: Cross between : AAcc * AACC
Offspring produced: AACc , AACc , AACc , AACc
Case3: Cross between aacc* AACC
Offsprings produced : AaCc ( all four )
Therefore we see That if the offfspring has one dominant C allele along with an A - The offspring produced will have agouti phenotype so, All offsprings are agouti.

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