How Humans Change Traits Practice Test

In a greenhouse with the same light and watering schedule each year, students selectively breed pea plants by saving seeds only from plants with purple flowers.

Flower color counts:

• Before selective breeding (Generation 0): 18 purple, 22 white
• After 3 generations: 31 purple, 9 white

What evidence best links the human action to the trait change?

A rabbit breeder says: “Selective breeding makes the trait appear instantly in the next generation.” The breeder is working in the same indoor conditions each year and selects only rabbits with black fur to reproduce.

Fur color data:

• Before selection (Generation 0): 40% black, 60% brown
• After 1 generation: 55% black, 45% brown
• After 4 generations: 85% black, 15% brown

Which claim about trait change is incorrect based on the data?