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Biology Terms Semester 2
Vocabulary Review
66
Biology
9th Grade
05/16/2012

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Term
transcription
Definition
a process where enzymes make an RNA copy of a DNA strand
Term
translation
Definition
the process of converting RNA code into an amino acid sequence
Term
mutations
Definition
a mistake or change in the DNA sequence
Term
incomplete dominance
Definition
the phenotype of a heterozygote is intermediate between the two homozygotes
Term
co-dominance
Definition
when phenotypes of both homozygotes are produced in the hertrozygote
Term
autosomes
Definition
matching homologous chromosomes ( the human cell has 22 pairs)
Term
sex chromosomes
Definition
the two chromosomes that determine which determine the sex of an individual
Term
sex-linked traits
Definition
traits controlled by genes on the sex chromosomes
Term
polygenic inheritance
Definition
inheritance pattern of a trait controlled by two or more genes
Term
carrier
Definition
heterozygous individual that appears the same ohenotype as homozygous dominant
Term
dominant autosomal
Definition
the dominant allele inherited from one parent that controls the dominant trait.
Term
polydactyly
Definition
having more than five (5) fingers or toes
Term
Huntington's disease
Definition
a lethal disease that is caused by progressive nervous system degeneration caused by rare autosomal dominant allele
Term
recessive autosomal
Definition
the recessive allele inherited from both parents that causes most genetic disorders, usually common to certain ethnic groups
Term
cystic fibrosis
Definition
most common lethal genetic disorder among white Americans. Causes lung and digestive tract problems
recessive autosomal
Term
sickle-cell anemia
Definition
autosmal recessive trait, common in black Americans. Causes sickle cell shaped red blood cells causing anemia.
Term
multiple allelic
Definition
inheritance trait that are controlled by more than three or more alleles. Blood type is an example.
Term
polygenic inheritance
Definition
inheritance pattern of a trait controlled by two or more genes
Sample: Skin Color
Term
sex-linked traits
Definition
traits controlled by genes located on the X or Y chromosome,
Example: ged-green color blindness
Term
irreducible complexity
Definition
theory that says biological system is too complex to to function if missing only one part
Term
macroevolution
Definition
evolution from one type of organism to another
Term
microevolution
Definition
gradual change of traits with an type of organism
Term
catastrophism
Definition
theory that major changes in the earth are caused by sudden catastrophic events. Example: Mt. St. Helen's eruption
Term
gradualism
Definition
theory the evolution occurs slowly, gradually over time and in small changes
Term
classification
Definition
the grouping of objects or information baed on similarities
Term
taxonomy
Definition
branch of biology concerned with the grouping and naming of organisms
Term
binomial nomenclature
Definition
system to scientifically name each organism with two names: genus and descriptive name.
Term
virus
Definition
tiny, nonliving particles that cause diease
Term
host cell
Definition
the living cell in which viruses reproduce
Term
bacteriophage
Definition
a virus that infects bacteria
Term
saprobe
Definition
bacteria organisms that feed on dead organisms or organic wastes
Term
aerobe
Definition
bacteria that require oxygen for cellular respiration
Term
anaerobe
Definition
bacteria than does not use oxygen for cellular respiration
Term
endospore
Definition
a hard outer covering that protects bacteria fron unfavorable environments
Term
toxin
Definition
a powerful poison that can cause sickness or death of an organism
Term
binary fission
Definition
the asexual reproduction of bacteria
Term
conjugation
Definition
a simple form of sexual reproduction of bacteria where on bacterium transfers all of its chromosome to another cell.
Term
nitrogen fixation
Definition
a bacteria process that converts N2 gas into ammonia (NH3)
Term
protozoan
Definition
animal like protists
Term
pseudopodia
Definition
a cytoplasm containing extensions of their plasma membranes used to engulf food
Term
flagellate
Definition
a phylum of protists that have one or more flagella
Term
ciliate
Definition
a phylum of protists that move by synchronized beating of cilia that cover their bodies
Term
sporozoan
Definition
parasitic non motile protozoans
Term
spore
Definition
a reproductive cell that can produce a new organism without fertilization
Term
algae
Definition
photosynthetic protists
Term
amoebas
Definition
protists that have no wall outisde their cell membrane and move by pseudopodia
Term
hyphae
Definition
threadlike filaments of fungi that develop from fungal spores
Term
mycelium
Definition
a network of branches of hyphae
Term
chitin
Definition
the complex carbohydrate found in cell walls of most fungi
Term
haustoria
Definition
specialized hyphae which penetrate and grow into host cells without killing them
Term
budding
Definition
a form of asexual reproduction in which mitosis takes place and a new individual grows out and separates from a parent cell.
Term
sporangium
Definition
a sac or case in which spores are produced
Term
rhizoid
Definition
other form of hyphae that penetrate down tinto the food and anchors to mycelium to its substrate
Term
ascus
Definition
saclike structures where sexual spores of fungi develop
Term
Basidium
Definition
fungi that have club shaped hyphae that produce spores
Term
mycorrhizae
Definition
a symbiotic relationship in which a fungus lives in close contact with the roots of a plant partner
Term
lichen
Definition
a symbiotic association between a fungus and green alga
Term
monocot
Definition
have one seed leaf in a seed
Term
dicot
Definition
have two seed leaves in a seed
Term
ecology
Definition
scientific study of interactions between organisms and their environments
Term
biosphere
Definition
the portion of the Earth that supports life and includes water land and atmosphere
Term
biotic factor
Definition
all living organisms that inhabit an environment
Term
abiotic factor
Definition
all nonliving parts of the environment
Term
niche
Definition
the roles a species plays in the community
Term
habitat
Definition
a place where an organism lives out its life
Term
trophic levels
Definition
each feeding step in the food chain that passes energy and materials
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