the most anterior portion of the frontal lobe of each of the brain's cerebral hemispheres. It acts in attention, planning, and memory and is separated into a dorsolateral region and an orbito-frontal region.PREFRONTAL CORTEX: The prefrontal cortex is commonly referred to as the frontal association area..he most anterior portion of the frontal lobe of each of the brain's cerebral hemispheres. It acts in attention, planning, and memory and is separated into a dorsolateral region and an orbito-frontal region.
Growing Seedless Watermelons. If youâve enjoyed a delicious seedless watermelon, you might wonder how they are grown. It starts by treating watermelon seedlings with a chemical that makes the plant have 4 times (4X) their normal number of chromosomes. After planting, when this watermelon flowers, it receives pollen from a nearby normal (2X) watermelon. The result is a fruit that has seeds that are 3X .
Thatâs what happens in most plants. To make seedless watermelons, scientists use a trick. They use a special chemical to give each seed twice as much DNA as a normal seed has. These seeds can grow into watermelon vines and make watermelons that contain seeds.But after one of these double-DNA seeds grows into a vine and that vine is fertilized by a normal plant, the new seeds will grow into an unusual vine.hatâs what happens in most plants. To make seedless watermelons, scientists use a trick. They use a special chemical to give each seed twice as much DNA as a normal seed has. These seeds can grow into watermelon vines and make watermelons that contain seeds.