Shown here are graphs that plot the percentage of fertilized...

Shown here are graphs that plot the percentage of fertilized eggs containing males against the atmospheric temperature during early development in
(a) snapping turtles and
(b) most lizards. Interpret these data as they relate to the effect of
temperature on sex determination.

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Key Concepts

Temperature-Dependent Sex Determination

This concept refers to the process by which the sex of an offspring is determined not by genetic factors but by the temperature conditions experienced during critical periods of embryonic development. Variations in atmospheric temperature can lead to shifts in the ratios of males to females, which is a common phenomenon in many reptiles and some fish species.

Graphical Data Interpretation

Interpreting graphs in this context involves analyzing how the percentage of males produced varies with atmospheric temperature. Recognizing patterns such as thresholds or inflection points in the curves allows one to understand the relationship between temperature and the resulting sex ratios, highlighting how environmental conditions can influence biological outcomes.

Developmental Plasticity

Developmental plasticity is the ability of an organism to alter its development in response to environmental conditions. In the context of sex determination, it explains how external factors like temperature can trigger different developmental pathways leading to the formation of either male or female individuals, underscoring the interplay between genetics and environmental cues.

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