During drought years, seeds with thin coats are more likely to desiccate (dry out) and not be able to germinate
when wet conditions return. If a drought persists for several years, what should one expect to result from natural
selection? (application level)
O Plants that produce seeds with thicker seed coats will be able to start making seeds with thinner coats, thus saving energy and
nutrients for future droughts.
O Fewer plants with thin seed coats will be able to germinate, leading to a higher proportion of plants that produce seeds with
thick seed coats.
Plants that produce seeds with thinner seed coats will anticipate the continuation of drought, and will start to produce seeds
with thicker seed coats.
O Drought conditions will mutate the seed coat genes with the result that later-generation offspring have thicker seed coats.

Respuesta :

Directional selection favors one of the extreme phenotypes. Option B). Fewer plants with thin seed coats will be able to germinate, leading to a higher proportion of plants that produce seeds with thick seed coats.

What is directional selection?

Directional selection increases in the proportion of individuals with an extreme phenotypic trait.

There must be a selective pressure or environmental pressure acting on populations to lead the species to increase the number of individuals expressing that extreme phenotype.

This selection presents more frequently in those cases in which interactions between living organisms and the environment modify in the same direction.

In the exposed example the environmental pressure is drought during several years.

Drought periods decreases the fitness of plants that produce thin seed coats because they dehydrate before germinating.

Originally the population expressed both types of seeds. But after the drought pressure, only plants that produce seeds with thicker coats got to survive and reproduce.

The correct option is B). Fewer plants with thin seed coats will be able to germinate, leading to a higher proportion of plants that produce seeds with thick seed coats.

You can learn more acout directional selection at

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