Naila :]

Naila :]

Tuesday, February 5, 2013

4th 6 weeks CBA Review Part 2

Explain variation within a population or species by comparing external features, behaviors, or physiology of organisms that enhance their survival. 
List examples of these types of variations-
External Features: camouflage, skin pattern, eye color
Behaviors: eating a lot, hiding when something moves
Physiology of Organisms: quantity of hearts, how many legs or arms
Explain how these are variations-
Hibernation: some animals hibernate in the winter because it is hard to find food, instead of searching for food, they fall into a deep sleep, for quite some time. It also reduces their heartbeat and their body temperature.
Migrations: To move to a warmer climate, they wouldn't survive in the cold.
Storage of food in a bulb: Because they're plants, they don't have anywhere to store their food except in their bulbs. Not everybody has bulbs, so it is a variation.

List some examples of changes in genetic traits that have occurred over several generations through natural selection and selective breeding:
1. Examples of traits changing through Natural Selection: gills, durable feet, camouflage 
2. Examples of traits changing through Selective Breeding: half rottweiler and labrador dogs, cats with tiger stripes

Investigate and explain how internal structures of organisms have adaptations that allow specific functions such as (Explain these examples)-
Gills in fish (what does this adaptation allow fish to do): to breath
Hollow bones in birds (How does this adaptation help birds): helps them be lighter whenever they fly
Xylem in plants (what does this help the plant do): to carry water up to their stem

Vocabulary (Define each of the following)
Heredity:The passing on of physical or mental characteristics genetically from one generation to another.
Genes: traits that are passed on from your parents
Chromosome: DNA that carries the genes and functions of your heredity information.
Nucleus of a cell: Contains your DNA within the membrane
Trait: A genetically determined characteristic.
Inherited: To receive a trait from ones parents
Dichotomous key: A reference tool where a series of choices between alternative characters leads progressively to the identification of the species
Sexual reproduction: producing offspring with sexual interaction (2 parents)
Asexual reproduction: producing offspring with no sexual interaction, and sometimes budding (1 parent)
Uniform: Offspring that is exactly like its parent, like a clone
Diverse: Offspring that is different from its parents
Binary fission: A type of asexual production common among prokaryotes wherein a cell divides giving rise to two cells, each having the potential to grow to the size of the original cell.
Offspring: a child, young, the result of reproduction
Variation/ genetic variation: having different qualities from genetics or by adapting
Natural selection:  Natural selection is the process of when a species becomes more specialized to suit their environments.
Selective breeding: When someone would like a specific type of breed, they put both animals together and make or let them have physical interaction. When they are done, there is an offspring with the certain characteristics the person wanted.
Adaptation: When the living thing have to get use to its surroundings, it has to adapt to be able to survive. When they reach the point of already adapting, it is adaption.
Bulb (part of the plant): It is like the end of the root, but not the end that is in the ground, if not the end that is the product. The plant uses it to store their food, and we use it for food for us.

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