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science Q4 study guide flatcards
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7th Grade
05/28/2014

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Term
sex chromosomes
Definition
are one of the 23 paris of chromosomes in each body cell
Term
sex linked genes
Definition

genes found on the X and Y chromosome

 

their alleles are passed from parent to child on a sex chromosome

 

 

Term
carrier
Definition
is a person who has one recessive allele for a trait and one dominant allele
Term
genetic disorder
Definition
is an abnormal condition that a person inherits through henes or chromosomes
Term
cystic fibrosis
Definition
is a genetic disorder in which the body produces abnormally thick mucus in the lungs and intestines
Term
sickle cell disease
Definition
is caused by a mutation that affects hemogolbin
Term
hemophilia
Definition
is a genetic disorder in which a persons blood clots very slowly or not at all
Term
down syndrome
Definition
people with this genetic disorder have an extra copy of chromosome 21 in every cell
Term
pedigrees
Definition
is a chart or "family tree" that tracks which members of a family have a particular trait
Term
karotype
Definition
is a picture of all the chromosome in a persons cell
Term
clone
Definition
is an organism that has exactly the same genes as the organisms from which it was produced
Term
genetic engineering
Definition
genes from one organism are transferred into the DNA of another organism
Term
gene therapy
Definition
will involve inserting copies of a gene directly into a persons cells
Term
selective breeding
Definition
the process of artifically selecting organisms with desired traits to be parents of the next generation
Term
hybridization
Definition
breeders cross two genetically different individuals
Term
inbreeding
Definition
involves crossing two indivisuals that have similar desirable characterics
Term
biotechnolgy
Definition
is the application of a technolgical proccess, invention, or method to a living organisms
Term
genome
Definition
an organisms full set of DNA
Term
ethics
Definition
is the study of princlples about what is right and wrong, fair and unfair.
Term
organism
Definition
living thing
Term
habitat
Definition
an enivornment that provides the things a specific organism needs to live, grow and reproducen
Term
species
Definition
is a group of organisms that can mate with each other and produce offspring that can also mate and reproduce
Term
population
Definition
all the members of one species living in a particular area
Term
community
Definition
all the different populations that live together in an area
Term
ecosystem
Definition
the communtiy of organisms that live in a particular area, along with their nonliving enivornment
Term
ecology
Definition
the study of how organisms interact with each other and with their enivornment
Term
producer
Definition
an organism that can make its own food
Term
consumer
Definition
an organism that obtains energy by feeding on other organisms
Term
herbivores
Definition
consumers that eat only plants
Term
carnivores
Definition
consumers that eat only animals
Term
omnivores
Definition
consumers that eat both plants and animals
Term
scavenger
Definition
is a carnivore that feeds on the bodies of dead organisms
Term
decomposers
Definition
break down wastes and dead organisms and return the raw material to the ecosystem
Term
food chain
Definition
is a series of events in which one organisms eats another and obtains energy
Term
food web
Definition
consists of many overlapping food chains in an ecosystem
Term
energy pyramid
Definition
shows the amount of energy that moves from one feeding level to another in a food web
Term
natural selection
Definition
a characteristic that makes an individual better suited to a specific environment may eventually become common in that species
Term
adaptions
Definition
the behaviors and physical charactertics that allow organisms to live sucessfully in their enivornment
Term
niche
Definition
the role of an organismsm in its habitat
Term
competition
Definition
the struggle between organisms to survive as they attempt to use the same limited resources
Term
predation
Definition
an interaction in which one organisms kills another for food or nutrients
Term
predator
Definition
the organisms that does the killing
Term
prey
Definition
the organism that is killed
Term
symboisis
Definition
is any relationship in which two species live closely together and at lest one of the species benefit
Term
mutualism
Definition
a relationship in which both species benefit
Term
commensalism
Definition
is a relationship in which one species benefits and the other species is neiter helped nor harmed
Term
parasitism
Definition
a relationship that involves one organism living with, on, or inside another organisms and harming it
Term
parasite
Definition
the organisms that benefits
Term
host
Definition
the organisms it lives on or in
Term
birth rate
Definition
of a population is the number of births in a specific population in a certain time period
Term
death rate
Definition
is the number of deaths in a specific population in a certain time period
Term
immigration
Definition
moving into a population
Term
emigration
Definition
leaving a population
Term
population density
Definition
the number of individuals in an area of a specific size
Term
limiting factor
Definition
is an enivornmental factor that causes a population to stop growing or decrease
Term
carrying capacity
Definition
the largest population that an area can support
Term
abiotic factor
Definition
a nonliving part of an organisms habitat
Term
biotic factor
Definition
a living or once living part of an organisms habitat
Term
wetland
Definition
is a land area that is covered with a shallow layer of water during some or all of the year
Term
Why are wetlands important?
Definition
Because of their sheltered water and rich supply of nutrients, wetlands provide habitats for many living things.  Wetlands also act as natural water filters. They can also help control floods by absorbing extra runoff from heavy rains
Term
what impact have humans had on the everglades?
Definition
the development of southern florida is resulter in changes to the flow of water across the everglades. water pollution has increased, and native plants and animal populations have declined
Term
What are wetlands?
Definition
the three common types of freshwater wetlands are marshes, swamps, and bogs.
Term
atom
Definition
the smallest part of an element that still has these same properties
Term
atomic number
Definition
the number of protons in an atom
Term
neutron
Definition
has no electrical charge
Term
protons
Definition
has a postivie charge
Term
electron
Definition
has a negative charge
Term
nucleus
Definition
protons and neutrons are always together in the center or ________, of the atom
Term
isotopes
Definition
when two atoms have the same number of protons, but different numbers of neutrons
Term
ion
Definition
if an atom loses or gains electrons and now has an unequal number of protons and neutrons
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