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ADAPTATIONS. Natural Selection. Natural selection - environment tend to survive and transmit their genetic characteristics in increasing numbers to succeeding generations while those less adapted tend to be eliminated. Gene frequency.

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Presentation Transcript
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Natural selection- environment tend to survive and transmit their genetic characteristics in increasing numbers to succeeding generations while those less adapted tend to be eliminated.

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Gene frequency- The frequency of occurrence of an allele in relation to that of other alleles of the same gene in a population.

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Structural Adaptations- The responsive adjustment of a sense organ, such as the eye, to varying conditions, such as light intensity

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Behavioral Adaptations- Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations.

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Physiological Adaptations- A metabolic or physiologic adjustment within the cell, or tissues, of an organism in response to an environmental stimulus resulting in the improved ability of that organism to cope with its changing environment.

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Extinction- In biology and ecology, extinction is the ceasing of existence of a species or a higher taxonomic unit (taxon), such as a phylum or class. The moment of extinction is generally considered to be the death of the last individual of that species or group.

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Endangerment- An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters

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Dichotomous Key- A reference tool where a series of choices between alternative characters leads progressively to the identification of the species.

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Acquired Traits- acquired traits can not be passed on genetically. You can\'t inherit your uncle\'s knowledge, skills, ideas or memories and it doesnt\' work that way with other organisms either. Acquired traits include things such as calluses on fingers, larger muscle size from exercise or from avoiding predators. Behaviors that help an organism survive would also be considered acquired characteristics most of the time. Things like where to hide, what animals to hide from and other behavior like that. For plants acquired characteristics might include bending because of wind

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Abiotic Factors- Abiotic, meaning not alive, are nonliving factors that affect living organisms. Environmental factors such habitat (pond, lake, ocean, desert, mountain) or weather such as temperature, cloud cover, rain, snow, hurricanes, etc. are abiotic factors.

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Homeostasis- The human body manages a multitude of highly complex interactions to maintain balance or return systems to functioning within a normal range. These interactions within the body facilitate compensatory changes supportive of physical and psychological functioning. This process is essential to the survival of the person and to our species. An inability to maintain homeostasis may lead to death or a disease, a condition known as homeostatic imbalance.

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Evolution- A gradual process in which something changes into a different and usually more complex or better form.

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Population- A population is all the organisms that both belong to the same species and live in the same geographical area.

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Species- A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring

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Migration- The seasonal movement of a complete population of animals from one area to another. Migration is usually a response to changes in temperature, food supply, or the amount of daylight, and is often undertaken for the purpose of breeding. Mammals, insects, fish, and birds all migrate. The precise mechanism of navigation during migration is not fully understood, although for birds it is believed that sharp eyesight, sensibility to the Earth\'s magnetic field, and the positions of the Sun and other stars may play a role

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Hibernation- is a state of inactivity and metabolic depression in animals, characterized by lower body temperature, slower breathing, and lower metabolic rate. Hibernating animals conserve food, especially during winter when food supplies are limited, tapping energy reserves, body fat, at a slow rate. It is the animal\'s slowed metabolic rate which leads to a reduction in body temperature and not the other way around. Hibernation may last several days or weeks depending on species, ambient temperature, time of year, and fur on the animal\'s body

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Camouflage- is a method of crypsis (hiding). It allows an otherwise visible organism or object to remain unnoticed, by blending with its environment. Examples include a tiger\'s stripes, the battledress of a modern soldier and a butterfly camouflaging itself as a leaf.

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Mimicry - the similarity of one species to another which protects one or both. This similarity can be in appearance, behaviour, sound, scent and even location

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Niche- is a term describing the relational position of a species or population in its ecosystem to each other

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Selective Breeding- the process of breeding plants and animals for particular genetic traits.

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Ancestor- a parent or a grandparent, great-grandparent, great-great-grandparent, and so forth

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Analogous Traits- corresponding in function, but not evolved from corresponding organs, as the wings of a bee and those of a hummingbird.

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Fossil Record- The totality of fossilized artifacts and their placement within the earth\'s rock strata. It provides information about the history of life on earth, for instance what the organisms look like, where and when they live, how they evolved, etc.

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Phylogenetic Tree- A phylogenetic tree or evolutionary tree is a branching diagram or "tree" showing the inferred evolutionary relationships among various biological species or other entities based upon similarities and differences in their physical and/or genetic characteristics. The taxa joined together in the tree are implied to have descended from a common ancestor.

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