These researchers studied the heritability of secondary sexual traits in guppies. Specifically body size, fin lengths, and spot brightness, among others, were measured. To records variation in spot brightness video cameras, photography, and computers were used to analyze differences in spot hue, spot saturation, and spot brightness. The inheritance of male traits was analyzed using offspring parent regressions. The data show that male guppies show high variation in sexual traits. Furthermore, regression analysis showed a significant relationships in traits such as fin lengths, body size, and area of orange spots between fathers and sons. Therefore, indicating that these traits are likely heritable. This experiment is very relative to Endler’s experiment because it shows that these traits are indeed heritable and variable.
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