Pigment in mouse fur is only produced when the C allele is present. Individuals
ID: 311509 • Letter: P
Question
Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the A, a alleles. AA or Aa results in agouti color, while aa results in black coats. What are the phenotypic ratios in the F2 generation of mice if an AACC parent and an aacc parent are bred to yield F1 mice which are then crossed to generate an F2 generation? Enter your answer as a fraction in the blank next to the appropriate coat color.
agouti ______
colorless_______
black________
Explanation / Answer
Answer:
AACC x aacc---------------parents
AaCc -----------------------F1(Agouti)
AaCc x AaCc
F2
agouti ___9/16___
colorless___4/16____
black___3/16_____
AC Ac aC ac AC AACC(Agouti) AACc(Agouti) AaCC(Agouti) AaCc(Agouti) Ac AACc(Agouti) AAcc(colorless) AaCc(Agouti) Aacc(colorless) aC AaCC (Agouti) AaCc (Agouti) aaCC (Black) aaCc(Black) ac AaCc (agouti) Aacc(colorless) aaCc(Black) aacc(colorless)