5. Incomplete dominance & Co-dominance, Scenario 1 – Ear spotting – Jaguars show

Question

5. Incomplete dominance & Co-dominance,

Scenario 1 – Ear spotting – Jaguars show spotting patterns on the inner fleshy part of their ears. The SZ allele causes square spots at the tip of the inner portion of the ear and SW allele causes egg-shaped spots at the base of the inner portion of the ear. Individuals are found in the population that have both types of spots, how can this be explained?

Scenario 2 – Apple seed number – the number of apple seeds per apple is a single-gene trait. The wild-type gene produces a protein that directly affects the number of seeds produced in a single apple. A frameshift mutation in the coding region of this gene leads to a truncated and non-functional protein. Apple trees that are heterozygous for this gene, have a fewer number of seeds in each apple than wild type but more than the homozygous mutant, how can this be explained?

Scenario 3 – Smurfs – Even though we all know from television that Smurfs are solid blue, the program creators curiously hid the fact that there are also solid yellow, green and white Smurfs occurring in most Smurf populations (Note: it is not known why the creators of the show did not disclose this heterogeneity in the population, but “60 minutes” is investigating it). In some matings of blue and yellow smurfs, green smurf offspring will result. When white smurfs mate, only white smurf offspring are created, how can this be explained? Linked and Un-linked genes and crossing-over.

Explanation / Answer

1. It means square spots at the tip of the inner portion of ear conrolled by SZ allele and egg shaped spots at the abse of the inner portion of the ear controlled by SW allele are codominant characters. That is the reason that both traits show expression within the same individual

2. It means number of apple seed production is character showing Incomplete dominance because in dominant homozygous form seed set is maximum and in heterozygous condition it is intermediate expression.

3. it means white smurf is a case of linkage.

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