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Science Vocabulary
Unit 4
16
Science
7th Grade
10/24/2011

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Term
adaptation
Definition
a characteristic that helps an organism survive and reproduce in its environment
Term
asexual reproduction
Definition
reproduction in which a single parent produes offspring that are identical to the parent
Term
chromomsome
Definition
a long molecule of DNA and associated proteins that is found in the nucleaus of eukaryotic cells
Term
dominant trait
Definition
the trait observed when at least one dominant allele for a characteristic is inherited
Term
deoxyribonucleic Acid (DNA)
Definition
hereditary material that controls all the activites of a cell: a molecule that provides instructions for making new cells and making molecules called proteins
Term
gene
Definition
a segment of DNA that caries hereditary instructions and is passed from parent to offspring: located on chromosomes
Term
geneotype
Definition
an organism's inherited combination of alleles
Term
macromutation
Definition
a mutation that has a profound effect ib the resulting organism
Term
meiosis
Definition
cell division that produces sex cells; chromosomes are copied once, and the cell divides twice
Term
mitosis
Definition
the part of the eukaryotic cell cycle in which chromatids are separated and two nuclei are formed
Term
mutation
Definition
a change in the type or order of the bases in an organism's DNA: Deletion, insertion, or substituion are the three main types of mutation
Term
natural selection
Definition
the process by which organisms with certain traits survive and reproduce at a higher rate than organisms without these traits
Term
phenotype
Definition
an organism's appearance
Term
recessive trait
Definition
a trait that is apparent only when two recessive alleles for the same characteristics are inherited
Term
sexual reproduction
Definition
reproduction that requires two parents and produces offspring that will share characteristics from both parents
Term
traits
Definition
different forms of a characteristic (brown or red hair)
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