24Structural Adaptations Mimicry is when one species (the mimic) looks like another species (the model) in order to deceive a third species.
25Structural Adaptations Batesian mimicry is when the model organism is dangerous or venomous, but the mimic is not dangerous.“Red on yellow,will kill a fellow.”King Snake (mimic) – harmlessCoral Snake (model) - venomous
26Structural Adaptations Mullerian mimicry is when both the model organism and the mimic are dangerous or distasteful.Monarch and Viceroy Butterflies – both taste bad
27Structural Adaptations Self mimicry is when a species fools its prey by looking inviting or familiar OR to scare off a predator.The owl butterfly’s eyespot canconfuse a predator OR gives thepredator a false target.
28Behavioral Adaptations Behavioral adaptations are actions or behaviors that help organisms survive and reproduce.Male bower bird decorates his nest to attracta mate.Bird of Paradise dances for a mate.
29Behavioral Adaptations The herding instinct is seen in cows, and they know a large group is less likely to be attacked than when alone.
30Often, adaptations are BOTH structural and behavioral Often, adaptations are BOTH structural and behavioral. Check out the Bird of Paradise. 2:40
31ExtinctionA species becomes extinct when all the individuals of a particular species die off.There have been several major extinction events in history.
32Extinction Cause: 1. Loss of Habitat As humans develop and occupy more space, and use more resources, habitats are destroyed.
33Extinction Cause: 2. Loss of Genetic Diversity Species NEED genetic variety to make it more likely to survive.A species is considered to be threatened if they are likely to become endangered due to low genetic variation.Cheetahs are threatened because they had to inbreed and now have low genetic variation.Cheetahs were greatly endangered about 10,000 years ago.The few that remained had to inbreed, which is why they are so identical today.
34Extinction Cause: 3. Competition with Exotic Species Humans often introduce a new species to an area because it is unique or pretty.If it has no known consumer, it will take over and kill native species.The kudzu plant was introduced into the Southern USA from Japan in the 1930sto help prevent soil erosion. It has taken over some areas because it grows so quickly (30 cm / day).
35Extinction Cause: 4. Inability to Adapt This is involved in rapid environmental changes, and can cause rapid extinction.If the climate changes suddenly, and a species doesn’t have any individuals with genetic traits that allow them to adapt, the entire species will go extinct.
36What is not an example of an adaptation? A inbreeding B camouflage 5.2 Adaptation and ExtinctionWhat is not an example of an adaptation?A inbreedingB camouflageC mimicryD behavior
37Why do some non-desirable traits remain in a population? 5.2 Adaptation and ExtinctionWhy do some non-desirable traits remain in a population?A selective breedingB mutationC they are genetically linked to more beneficial traitsD they may be useful in the future
38C loss of genetic diversity D competition with exotic species 5.2 Adaptation and ExtinctionWhat cause for extinction would most likely be involved in rapid environmental changes such as climate change?A loss of habitatB inability to adaptC loss of genetic diversityD competition with exotic species
39Which of the causes of extinction is not influenced by human actions? A inability to adaptB loss of genetic diversityC loss of habitatD competition with exotic species
40Why do desert rabbits have mottled fur? A behavioral adaptationsB mimicryC camouflageD incomplete dominance
41When do we designate a species as threatened or endangered? SCI 3.eWhen do we designate a species as threatened or endangered?A when there is one population leftB when the number of individuals falls below a certain levelC when population numbers are decliningD when genetic variation is low