In pedigree charts, the following symbols are standard:
Circle: Female
Square: Male
Shaded/Filled-in Shape: Indicates an affected individual (has the trait or condition being studied)
Unshaded/Empty Shape: Indicates an unaffected individual
Therefore, an affected male would be represented by a shaded (filled-in) square.
Based on this, the correct answer is
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Approach Solution -2
In pedigree analysis, squares represent the males while circles represent the female individuals. Since the horse breeder wants to show the male horse who is affected by the target gene, he should represent it with a shaded square. A shaded square in pedigree represents the affected males. Unshaded squares would represent the unaffected normal males. The correct answer is (D) : .
