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Fossil Eval

What does it mean for a species to become extinct? A species becomes extinct when the final member of the species dies and there are no surviving offspring
What could cause extinction? Environmental change Loss of food source Disease Etc.
What is a fossil? A fossil is the preserved remains of a species that lived in the past
Give three examples of things that could become fossilized. A footprint A piece of bone A tooth
How do fossils help scientists collect evidence that evolution has occurred? Fossils allow paleontologists to understand when former species lived as well as make observations and inferences about the way they lived.
What type of scientist studies these fossils? Scientists that study fossils are known as paleontologists
What types of life are the oldest on Earth? Single-celled or multi-celled? Single-celled organisms are the oldest forms of life on the planet.
What does “diversity of species mean? Diversity of species means there are many different kinds of organisms
What is natural selection? The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
How long does this process usually take? The process usually takes thousands of generations to see an effect
What is an observation? OBSERVATION: The act of viewing or noting something with one of the senses (see, hear, smell, taste or touch) It is a fact EX. The footprint has 3 toes
What is an inference? INFERENCE: A proposed conclusion based on an observation It does not always have to be correct EX. After looking at fossilized footprints you decide the organism had started to run
TRUE or FALSE: Humans have had no impact on the evolution of other species. FALSE: Humans impact the evolution of other species in many ways Hunting Habitat Destruction Pollution
What is genetic variation? Genetic variation is differences that are caused by an organism’s genes Variation is usually caused by a MUTATION in the organism’s DNA
What causes this variation and how does that lead to natural selection? This variation allows certain individuals to be better suited for their environment and have a higher chance at reproducing and passing their genes to their offspring. Ex. The beige worms were easier to see so they got eaten in Activity 91
What is a mutation? A mutation is any change in an organism’s DNA Typically these mutations occur during the fertilization Ex. A hornless cow gives birth to a cow with horns
How do mutations affect an individual? Some mutations are beneficial and lead to organisms having a greater chance at reproduction EX. 4 tined beak Some are harmful and do not help an organism Ex. genetic disorder Some have no effect on the organisms Ex. different color coat on a dog
What is the difference between an acquired and inherited trait? Acquired Traits: Traits that an individual gains during the course of their life that are not genetic Inherited Traits: Traits that are determined by an individual’s genetic makeup and are determined during fertilization
Which type of trait gets passed to offspring? Genetic Traits are passed to offspring during sexual reproduction
If two species have DNA that is very similar they are (MORE or LESS) closely related If two species have very similar DNA they are MORE closely related than individuals with DNA that is not similar. This means they shared a common ancestor relatively recently
Describe bacterial resistance using natural selection. When bacteria are resistant to a certain antibiotic, they reproduce with their offspring having the same resistance
Created by: JayDubs777