Get Natural Selection Gizmo Answer Key Pdf 2020-2025

No individual moths changed colors. each year, the best hidden moths survived and reproduced. This caused an increase in frequeny of well-hidden moths over time. that new trait to spread throughout the population.

Genetic Changes Moths passed their color to the next generation. Eggs from light moths developed into light moths and dark moth eggs turned to dark adults. The dark color was caused by a mutation in the DNA of a single moth, and the mutated gene had been passed to all its offspring.

What is the evidence that the peppered moth example meets this necessary condition? Natural selection has occurred in peppered moth populations. The black form of the peppered moth was very rare in England before 1850. After that date, industrialization resulted in air pollution which darkened tree trunks and branches.

Tutt suggested that the peppered moths were an example of natural selection. He recognized that the camouflage of the light moth no longer worked in the dark forest. Dark moths live longer in a dark forest, so they had more time to breed. All living things respond to natural selection.

Before 1850, most moths in England were light and lived in light-colored trees. When the industrial revolution hit England, black soot was released into the air and stuck to the trees, causing them to darken in coloration. During this time, light moth populations decreased and the number of black moths increased.

The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.

The peppered moth case study described above is an example of directional selection: the frequency of color varieties changes dramatically in one direction or another (lighter or darker) in response to the predominating habitat conditions.

They were eaten by birds more and more, while the rare dark colored moths blended in better on the darker trees. This made the dark colored moths have a higher survival rate. They lived longer and passed their dark colored genes onto their offspring or young.

Expert Answer. A light-colored moth will be easier to spot on a dark tree trunk. The color of moths helps them to hide on tree trunks from their potential predators like birds.