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22 Cards in this Set
- Front
- Back
fish
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have scales , breath with gills and lay eggs in water to produce offsping
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Reptiles
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have scales, breathe with lungs and lay eggs on land to produce offspring
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Amphibians
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have smooth skin, breathe with lungs or gills and lay soft eggs in water
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Flowering Plants
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rely mainly on bees and birds to spread their pollen from one plant to the pistil of another plant
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Non-flowering Plants
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pollen is spread by wind
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DNA
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is the chemical compound that codes all life and is found in the chromosome of each cell
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Genotype
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is the two letter code for a specific trait
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Phenotype
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is the physical appearance of a specific trait, for example blond hair or brown hair;it what you see.
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Dominat traits
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are always expressed when their genes are present because they are strongest
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Recessice traits
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seem to disappear when only one weaker gene is present because it is hidden by stronger gene.
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TWO
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recessive gene must be present in order for the recessive trait to be expresssed
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Chromosomes
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Genes are segments of DNA found
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Half
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In sexual reproduction, each parent contributes half of their chromosomes to create life.
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Inherited traits
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are passed on from parent to offspring.
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Acquired traits
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are gained or learned from the environment;one is not born with these traits.
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Selective breeding
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occurs when humans choose which traits show up in a population
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Toxins
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Exposure to toxins in the environment can genetically change a living thing
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Birds
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have feathers and lay eggs to produce offspring, while mammals have hair/fur, and nurse their young
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Fossils
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provide important evidence of how life and environmental conditions have changed over time
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Evolution
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the theory of evolution states that all living things change over time
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Mutations
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Random genetic changes in an organism are called mutations
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Common ancestors
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All living things are related to one another to varying degrees because they share common ancestors
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