Darwin studied different types of
finches while visiting the Galapagos
Island.
All the birds were similar in size, color,
shape, and habitat (aspects) except they
had different beaks.
Darwin thought all finishes might come
from one ancestor
Variations that favor survival are more likely to be passed to the next generation.
Those variations do not favor survival are less like to be passed on to the next generation.
Variations can help a species live long enough to successfully reproduce.
Same thing also occur in plants.
Many plants are suited to live in particular climates.
• Darwin noticed that each species of finches was well
suited to its particular environment
• Each beak of finch enabled the finches to eat particular
seed or insect.
• Each beak type is called Variation or differences among
members of the same species.
• Differences are caused by change in an organism
genetic which is called Mutation
Cause
Mutation Disorder in organisms
DNA
VariationsChanges in organisms
genetic setup
Effect
Different
beaks in
finches
Enables
species to live
longer
Which enables
in reproduction
A variation that
favors survival
Pass the
traits to
offspring's
How are variations passed down through
generations?
QUESTION: Why do most organisms produce more off springs than survive in the environment
Answer: producing more offspring to ensure that at least a few will survive and reproduce
In nature organisms compete for natural resources such as food, water and space sunlight
Survival of fittest is another way to describe natural selection
Plant and animals have more offspring than their environments can support to ensure that enough will survive to carry the species into the future
Animals whose fur or skin color blend in with their environments are much likely to hide from or escape their predators than are more noticeable animals( camouflage)
In some species Vivid (strong)coloring can warn predator that an organism is dangerous, tasted bad , or is poisonous
What is another name for natural selection
Survival of fittest
How does variations help an organism survive in its environment
Organisms with a traits that are better suited for survival in environment, are more likely to reproduce and pass these traits to their offspring
How can an animal‘s coloring affect its chances of survival?
Colo
r
Camouflage in animals
Could make animal more noticeable
Helps it to attract and mate
Cause Effect
Antibiotic are medicines people take for diseases
Anti means against. Biotic means life
This medicine kills live bacteria
Q/ Why should people complete a course of anti biotic?
A/ The strongest bacteria take the longest time to be killed by anti biotic
Q/ What some process enable some bacteria to resist the anti biotic?
A/ Natural selection
Q/ What do you think might happen if more bacteria become resistance to antibiotic?
A/ New strong medicine will be needed
Science Grade 6
Mrs. Deema Anabosi