Question

Assume this pedigree shows another Dalmatian family. Which cross shows a result that IS ONLY POSSIBLE if if the black spotted trait is controlled by a dominant allele and the liver spotted trait (open symbols) is controlled by the homozygous recessive genotype?

Answer 1

Hello. You forgot to attach the pedigree image. Anyway, this image is attached below:

Answer:

The generation I cross that created generation II

Explanation:

Dominant alleles are those that can determine a phenotype even when they appear in a single dose. This means that when we analyze a pair of alleles for a characteristic, if only one of them is a dominant allele, that characteristic is expressed. The recessive alleles, unlike the dominant ones, need to be in pairs for the characteristic to express itself. This means that in heterozygous individuals the recessive allele will not determine the phenotype.

In this way, we can see that the dominant alleles are easier to be expressed and will probably appear more frequently in the first generation of the offspring. Thus, in relation to the question above, we can say that the correct answer is "The generation I cross that created generation II "