Consider the example of different color morphs found in wings of moths. Darker moths are more readily eaten than light moths. What is the explanation for certain color morphs having higher Darwinian fitness than others?

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Juvenile moths develop at different temperatures. The difference in temperature causes a change in color as the moths age, from dark to light wings. The juveniles that become adults and have lighter wings have higher Darwinian fitness because they will produce more offspring than dark individuals.

Moths that have lighter wings have higher Darwinian fitness because they are better camouflaged while resting on light-colored trees. When birds hunt during the day, they are more likely to eat darker individuals. Lighter individuals will survive to reproduce and have more offspring than darker individuals.

Juvenile moths eat different things than adults. The difference in nutrition causes a change in color as the moths age, from dark to light wings. The few juveniles that survive to become adults are lighter and have higher Darwinian fitness because they will produce offspring.

Moths that have darker wings actually have higher Darwinian fitness because the birds cannot see them as well as they can see light individuals while hunting at night. These individuals will survive to reproduce and have more offspring than lighter individuals.

 

asked Dec 28, 2012 in Biology by anonymous
    

1 Answer

+1 vote

 

Moths that have lighter wings have higher Darwinian fitness because they are better camouflaged while resting on light-colored trees. When birds hunt during the day, they are more likely to eat darker individuals. Lighter individuals will survive to reproduce and have more offspring than darker individuals.

 

answered Dec 28, 2012 by Panda ~Expert~ (1,557 points)

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