A) All round seeds
B) 3 round seeds, 1 wrinkled seed
C) All wrinkled seeds
D) ? RR, ? Rr, ? rr
A separate gene, which is not linked to the agouti gene, can result in either a dominant black pigment or a recessive brown pigment (B = black; b = brown).
A litter of mice from the mating of two agouti black parents includes offspring with the following fur colors:
-solid color, black
-solid color, brown (sometimes called chocolate)
-agouti brown (sometimes called cinnamon)
What would be the expected frequency of agouti brown offspring in the litter?
F) not enough information given
-The AY allele is dominant to both A and a.
-The homozygous genotype (AYAY ) results in lethality before birth.
-The heterozygous genotypes (AYA or AYa) result in yellow fur color, regardless of which alleles are present for the B/b gene. (This effect exhibited by the AY allele is known as epistasis–when the expression of one gene masks the expression of a second gene.)
In a mating of mice with the genotypes AYaBb x AYaBb , what is the probability that a live-born offspring will have yellow fur?
Express your answer as a fraction using the slash symbol and no spaces (for example, 1/16).