MCAS Life Science Review

Cells Animal Plant http://www.youtube.com/watch?v=-zafJKbMPA8

Cells: Similarities Plant Animal Cell Membrane Cytoplasm Nucleus Mitochondria Organelles: Small ,membrane enclosed, parts of the cell that do a specific job.

Cells: Differences Plant Animal Cell Wall Vacuole Chloroplasts Organelles: Small ,membrane enclosed, parts of the cell that do a specific job.

Cells Questions: 1. What type of cells are these? 2. How can you tell? 3. What is the importance of the green organelles?

Types of Cells There are many different types of cells. Different cells can look very different. Their shape and size help them do their specific job. Red Blood Cells Neurons: Brain Cells Cardiac Muscle Cells

Body Organization

Human Body Systems

DNA, Genes, and Heredity

DNA, Genes, and Heredity

Can you tell if this DNA came from a boy or a Girl? DNA, Genes, and Heredity This is a Karyotype. It shows the 23 PAIRS of chromosomes in one human skin cell. These chromosomes contain DNA. 23 individual chromosomes came from the mother and23 of them came from the father. Can you tell if this DNA came from a boy or a Girl? It’s a BOY! XY is a boy and XX is a girl

Punnett Square for Gender

Punnett Squares

Genotype and Phenotype Genotype: the genes passed down from the parents Phenotype: the trait that you can see

Punnett Squares What percentage of the offspring will have yellow Seeds? Green Seeds?

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Sexual vs. Asexual Reproduction 2 Parents Offspring are NOT identical to the parents More genetic diversity Asexual Reproduction: 1 Parents Offspring are identical to the parent

Sexual vs. Asexual Reproduction Question: Which type of reproduction will lead to greater genetic diversity in a population?

Food Chain All organisms in an ecosystem Arrows go in the direction of Energy flow Producers (Plants) convert solar energy into food for all other organisms to use

Food Chain: Trophic Levels Feeder Level Plants PRODUCE their own food Primary (First) Consumers Eat ONLY Plants - Herbivores Secondary Consumers Eat Primary Consumers Tertiary Consumers Eat Secondary Consumers Top Predators - Carnivores

Food Web http://www.youtube.com/watch?v=EdKhQVHc3Ao The interactions of all organisms in an ecosystem Arrows go in the direction of Energy flow Producers (Plants) convert solar energy into food for all other organisms to use http://www.youtube.com/watch?v=EdKhQVHc3Ao

Symbiosis Relationships between Organisms Mutualism Parasitism Commensalism Predator -Prey

Evolution By Natural Selection Natural selection is simply the logical result of four features of living systems: variation - individuals in a population vary from one another inheritance - parents pass on their traits to their offspring genetically selection - some variants reproduce more than others time - successful variations accumulate over many generations http://www.nhm.ac.uk/nature-online/evolution/what-is-evolution/natural-selection-game/the-evolution-experience.html http://www.techapps.net/interactives/pepperMoths.swf

Darwin’s Evidence for Evolution

Evolution of Bacteria

Classification

Classification