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Biology Unit test Flash Cards
Biology Unit flash cards
57
Biology
9th Grade
03/13/2012

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Term
Recessive trait
Definition
a trait that appears only if both members of a pair of alleles posses it.
Term
Allele
Definition
a possible version of a gene, which codes information for a specific trait, or version of a characteristic.
Term
Hybrid
Definition
an individual produced by crossing 2 purebred parents that differ a trait.
Term
Chromosome
Definition
a structure in the cell nucleus that contains DNA
Term
Haploid
Definition
the characteristic of having a single set of chromosomes; two haploid cells join together in the process of fertilization.
Term
Cytoplasm
Definition
fluid in the cell where nutrients are absorbed, transported and processed.
Term
Golgi apparatus
Definition
an organelle that processes and packages proteins.
Term
Centriole
Definition
a barrel shaped organelle found only in animals essential to cell division.
Term
Lysosome
Definition
organelles that contains enzynes that break down larger molecules.
Term
Vacuole
Definition
an organelle that stores water, sugar, minerals and proteins.
Term
Ribosome
Definition
an organelle that assembles proteins for growth and reproduction.
Term
Chloroplast
Definition
an organelle specific to plants that contan chlorophyll and coduct photosynthesis.
Term
Interphase
Definition
rapid growth, chromosomes duplicated.
Term
Mitosis
Definition
the phase of a cell cycle during which the nucleus divides to produce an exact copy of itself.
Term
Meiosis
Definition
the process of cell division that produces gametes, each with half the number of chromosomes of the parent cell.
Term
Telophase
Definition
nuclear membrane forms around the chromosomes. Cytokinesis begins.
Term
Metaphase
Definition
double stranded chromosomes line up in the middle of the cell.
Term
Nucleolus
Definition
spherical organelles inside the nucleus which makes proteins and ribosomes
Term
Prophase
Definition
individual chromosomes are now two identical strands. Nuclear membrane begins to dissolve.
Term
Anaphase
Definition
each chromosome splits and the halves move to opposite poles of the cell.
Term
Modern Cell Theory
Definition
All living things are made up of one or more cells. The cell is the functional unit of life. All cells come from pre-existing cells.
Term
Binary Fission
Definition
occurs when single-celled organisms divide into two identical cells. I.e.: bacteria, amoeba.
Term
Budding
Definition
the parents produces a small bud or a mini clone that eventually detach and become seerate individuals. Organisms such as the hydra and yeast reproduce by budding.
Term
Parthenogenisis
Definition
the process by which unfertilized haploid eggs mature into new organisms. Ants, bees an d certain species or snakes and lizards. Fertilized eggs become workers while unfertilized eggs become drones.
Term
Spores
Definition
haploid cells that can develop into new organisms (they are not sex cells, but are still reproductive cells.) cannot be fertilized. Fungal, green algae, mold
Term
Vegetative Reproduction
Definition
reproduction of offspring by plants that does not include seeds. Root formation, spider plants, rhizomes (small thin underground spider plants)
Term
fragmentation
Definition
new organisms formed from a piece of the existing parent. Example: starfish and some worms.
Term
Grafting
Definition
a process in which a part of one is joined with another plant called the parent or root.
Term
Plant Cell Culture
Definition
plant cells are placed in a petri dish containing nutrients and other chemicals. They will grow into individuals and becoming seedlings, ready to be planted in soil.
Term
Discreet Variations
Definition
Refers to traits that have a defined form, particular species of plants may produce only white and purple flowers.
Term
Continuous Variations
Definition
refers to traits that have a range of forms. For example the height of average adult humans range from 1.2 m to 2.1 m
Term
variation and the enviroment
Definition
two identical plants, one in the sun and one in dim light, each will grow differently. The environment in each will grow differently. The environment in which an organism is exposed to can and will affect the way the organism grows.
Term
cytokinesis
Definition
Term
asexual reproduction
Definition
Term
sexual reproduction
Definition
Term
zygote
Definition
Term
deoxyribonuclei
Definition
Term
c acid
Definition
Term
replication
Definition
Term
mutations
Definition
Term
cancer
Definition
Term
carcinogen
Definition
Term
reproductive cells
Definition
Term
tumour
Definition
Term
benign
Definition
Term
malignant
Definition
Term
stem cells
Definition
Term
cloning
Definition
Term
hermaphrodite
Definition
Term
external fertilization
Definition
Term
internal fertilization
Definition
Term
gametes
Definition
Term
nitrogen bases
Definition
Term
adenine
Definition
Term
thymine
Definition
Term
guanine
Definition
Term
cytosine
Definition
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