Question

In: Biology

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 albino

b. Only agouti

c. Only black

d. A combination of black, agouti and albino

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

Expert Solution

black pigmentation = CC

albino = cc

agauti = AC

the agauti is expressed only when both the dominanat allele [A and C] inherit together. this shows that A is complementarory factor of C to produce thye agauti phenotype . If AA or aa is present the with cc the trait may be albino. If the aa CC is a combination the trait is again found albino. If aaCC combination is there the trait is black pigmented .

One albino rodent from unknown genotype mates an agouti rodent that is known to be homozygous dominant for both genes.

answer :- as we see above , there are two chances of combination for albino-

aaCC
AAcc

the agauti rodent genotype = AACC

let us cross any one of the albino with agauti

PARENT 1. = aaCC x AACC

GAMETES = aC AC

result combination = AaCC [all agauti]

PARENT 2 = AAcc X AACC

GAMETES = Ac AC

result combination = AACc [all agauti]

so your answer will be option b- only agauti

gladiator answered 2 years ago

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