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What is a fossil? Give three examples of things that could become fossilized. A fossil is the preserved remains of a species that lived in the past EXAMPLES: A footprint A piece of bone A tooth
How do fossils help scientists collect evidence that evolution has occurred? What type of scientist studies these fossils? Fossils allow paleontologists to understand when former species lived as well as make observations and inferences about the way they lived.
What does it mean for a species to become extinct? What could cause extinction? A species becomes extinct when the final member of the species dies and there are no surviving offspring Things that could cause extinction: Environmental change Loss of food source Disease
What types of life are the oldest on Earth? Single-celled or multicelled? Single-celled organisms are the oldest forms of life on the planet They first appeared on the planet MILLIONS of years ago
What does “diversity of species mean? Diversity of species means there are many different kinds of organisms
What is natural selection? How long does this process usually take? The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The process usually takes thousands of generations to see an effect
What is an observation? What is an inference? Give an example of each. The act of viewing or noting something with one of the senses A proposed conclusion based on an observation
TRUE or FALSE: Humans have had no impact on the evolution of other species. A proposed conclusion based on an observation
What is genetic variation? What causes this variation and how does that lead to natural selection? Genetic variation is differences that are caused by an organism’s genes Variation is usually caused by a MUTATION in the organism’s DNA This variation allows certain individuals to be better suited for their environment
What is a mutation? How do they affect an individual? A mutation is any change in an organism’s DNA Typically these mutations occur during the fertilization Some mutations are beneficial and lead to organisms having a greater chance at reproduction
What is the difference between an acquired and inherited trait? Which type of trait gets passed to offspring? Traits that an individual gains during the course of their life that are not genetic 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. Originally most bacteria were non-resistant to antibiotics and died Some had the resistance gene and were able to survive the medicine They passed that gene to their offspring
Created by: RedBulls99