Pigment in mouse fur is only produced when the C allele is presen...

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.

In three crosses between agouti females whose genotypes were unknown and males of the aacc genotype, the following phenotypic ratios were obtained:

(1) 8 agouti (2) 9 agouti (3) 4 agouti
8 white 10 black 5 black
10 white

Accepted Answer

Hi everyone, let's look at our next problem. It says alleles Big A. And Big B. Are completely dominant over little A. And little B. Respectively. Consider the independent assortment of genes and predict the probability of having the big a little a big B. Little B. Genotype and a cross between a big A. Big a Big B. Big B. And little a little a little B. Little B. So we're looking at a cross where the parents look like this. So homicide is dominant and homicide is recessive. So we don't even need to think too hard about this because when we think about what kind of gametes these parents can produce, Each parent can only produce one kind of gamut. This parent only has Big A. And Big B. All the gametes will be the two dominant alleles. The reverse is true. The other parent, they only have little A. And little B. All the gametes will be little a little B. So as a result put these together your offspring, we'll have to inherit big A. From this parent and little A. From this parent, that's the only kind of damage they can give Big B. From this parent and little B. From this parent. Since those are the only gametes available. So all of the offspring. So choice. A 100%. We'll have this heterocyclic dominant. I mean, sorry, hetero ziggy's on both traits as their genotype. Since that is the only combination that's possible from these two particular parents? So again, what's the probability of having this big a little a big b. Little b. genotype in this particular? Cross between the parent, dominant in both traits and recesses in both traits? It's choice. A 100%. See you in the next video.

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