A Group of Island Birds Have Beaks That Are on Average

question 42

Short Answer

A group of island birds have beaks that are on average 20 mm long with a standard deviation of 1 mm. Beak length is a genetically based trait with a heritability of 0.5. Only small seeds are available for these birds to consume, and some of the large-beaked birds are unable to reproduce. The group of birds that successfully reproduces has an average beak size of 16 mm. Based on this information, predict how much the beak size is expected to change in the next generation.

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Definitions:

Behavioral Interventions

Techniques and strategies employed to influence and change an individual's behaviors in a positive way.

Moderate Physical Activity

Exercises that elevate the heart rate to a level where speaking is possible but not easy, beneficial for overall health.

Moderately Vigorous Activity

Physical activity that is energetically demanding to some extent but not to the degree of causing excessive fatigue or physical stress.

Aerobic Exercise

Physical activity that improves cardiovascular endurance by promoting the circulation of oxygen through the blood.