What is the chance that their baby dragon is golden with white flame?

Question

Hagrid the Half-Giant breeds dragons. They have two genes located on the same autosome. (Assume human genetics for dragons :)

Gene A/a is responsible for skin color (golden dominant over silver)

Gene B/b is responsible for flame color (yellow dominant over white)

The distance between genes is 20 map units.

A golden dragon with yellow flame (heterozygous for both genes) is bred with a silver dragon with white flame. What is the chance that their baby dragon is golden with white flame?

what is a chance to obtain a silver baby dragon with white flame?

Answer 1

To answer this question, it makes sense to draw Punnett squares. But, before doing so, you have to sort out the below information:

We know that one parent is gold with yellow fames, and heterozygous for both traits/genes (having an upper case and lower case allele). So the first parent is Aa (golden trait) and Bb (yellow trait).

The second parent is silver with white flames, if golden and yellow traits/genes are dominant, then silver and white are recessive (have lowercase alleles). So second parent is aa (silver trait) and bb (white trait).

According to Mendel, traits assort independently, in this case, skin color and flame color would assort independently. So, when doing Punnett squares, you would have to mate Aa with aa, and see the results. Then you would compose another Punnett square, mating Bb with bb to see the results.

(Hint: Genotypes AA and Aa have the golden skin color phenotype, and genotype aa is a silver color phenotype. Genotypes BB and Bb have the yellow flame phenotype, and genotype bb is a white flame phenotype)