1) In dragons, scale color is under the control of two genes, A and B. When two

Question

1)

In dragons, scale color is under the control of two genes, A and B. When two AaBb dragons are crossed, the result is 9 gold scaled: 7 silver scaled. This ratio indicates that

all gold-scaled dragons are aabb

all gold-scaled dragons are either aaBb or aaBB

all gold-scaled dragons have at least one dominant allele at both loci

all gold-scaled dragons are dihybrids

None of the above

2)

in mice, coat color can be agouti, black, black back and yellow belly, but 99% of mice are actually agouti. this means that coat color is :

dominant

monomorphic

polymorphic

lethal

all gold-scaled dragons are aabb

all gold-scaled dragons are either aaBb or aaBB

all gold-scaled dragons have at least one dominant allele at both loci

all gold-scaled dragons are dihybrids

None of the above

Explanation / Answer

Ans 1:

(C) all gold-scaled dragons have at least one dominant allele at both loci.

This situation corresponds to 9:7 complementary genes.

Let us say, A allele codes golden and B codes silver.

When AaBb is selfed, in F2

All with A_B_ genotype will have golden scales. (At least one dominant allele at both loci ).

Whereas, aa__, __bb & aabb will result into silver scales. .

Ans2: monomorphic.

Coat colour in mice is generally determined by the agouti gene which had three forms.

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