Researchers plotted a distribution curve for leg length in a population of birds, with length from short to long on the x-axis. The curve shifts to the right after a disturbance. Which statement is correct about natural selection in this population of birds?

Question

1. Birds with long legs were selected for.
2. Birds with medium-length legs were selected for.
3. Birds with short legs were selected for.
4. Birds with long legs and birds with short legs were selected for.

Answer 1

The correct statement about natural selection in this population of birds is:

1. Birds with long legs were selected for.

When a distribution curve shifts to the right, it indicates that the average trait value (in this case, leg length) has increased. This suggests that individuals with longer legs have a selective advantage following the disturbance, leading to their increased representation in the population over time.