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For dog coat color, the dominant S allele results in full pigmentation while the recessive si allele leads to white patches on the legs and belly called Irish spotting. Two fully-pigmented dogs have puppies with Irish spotting. What is the approximate fraction of offspring with Irish spotting expected from this cross

Sagot :

Oseniidn

The approximate fraction of offspring with Irish spotting expected would be 1/4

Monohybrid crossing

For full pigmented dogs, the genotype would either be SS or Ss since S is dominant over s.

However, the two fully pigmented dogs gave birth to puppies with Irish spotting. Meaning that they are both heterozygous for the gene.

Thus:

                       Ss    x    Ss

                     SS    Ss    Ss    ss

Offspring:

SS - fully pigmented - 1/4

Ss - fully pigmented - 1/2

ss - spotted - 1/4

Thus, the approximate fraction of the offspring with Irish spotting expected is 1/4.

More on monohybrid crossing can be found here: https://brainly.com/question/1185199

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