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22 Cards in this Set

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