Question

selection practice (cw) name: nothie kelly directions: in the spaces below, write which of the conditions required for natural selection is being described. choices: genetic variation, overproduction, and varied fitness. 1. : this condition states that more individuals must inhabit an area than the area can sustain for natural selection occur. 2. : this condition states that some individuals inhabiting an area must be better at surviving for certain ones to pass on their genes. 3. : this condition states that the offspring produced are slightly different, and those differences lead to some being better fit to survive than others. a certain species of snail shows variation in its shell coloring, from solid yellow shells (left) to brown - banded shells (right). birds are the main predator of this snail. a scientist observes populations of this snail in various habitats. she hypothesizes that the brown - banded snails are better camouflaged in grasslands than the yellow snails are. 4. based on the scientists hypothesis, which snails would be greater in numbers in grasslands? why? 5. what change in the environment might cause the yellow snails to be greater in number?

Explanation:

1. Overproduction means more individuals than the environment can support, which is what the first - described condition is.
2. Varied Fitness implies that some individuals are better at surviving and passing on genes.
3. Genetic Variation is when offspring have differences that affect survival.
4. Brown - banded snails would be greater in number in grasslands because, according to the hypothesis, they are better camouflaged, so they have a survival advantage.
5. A change like a dominant yellow - colored vegetation in the environment might cause yellow snails to be better camouflaged and thus greater in number.

Answer:

1. Overproduction
2. Varied Fitness
3. Genetic Variation
4. Brown - banded snails; because they are better camouflaged in grasslands.
5. A change to a dominant yellow - colored vegetation in the environment.