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unit 4 vocabulary
over genes and traits and all that stuff!
16
Science
7th Grade
10/24/2011

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Term
adaption
Definition
a characteristic that helps an organism survive and reproduce in its environment
Term
asexual reproduction
Definition
reproduction in which a single parent produces offspring that are identical to the parent
Term
chromosome
Definition
a long molecule of dna and associated proteins that is found in the nucleus of eukaryotic cells
Term
dominant trait
Definition
the trait observed when at least one dominant allele for a characteristic is inherited
Term
deoxyribonudeic acid (dna)
Definition
heredity material that controls all the activities 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 carries heredity instructions and is passed from parent to offspring located on chromosomes
Term
genotype
Definition
an organisms inherited combination of allele's
Term
macromutation
Definition
a mutation that has a profound effect ont the resulting organism
Term
meiosis
Definition
cell division that produces sex cells; chromosomes are copied once, and the cells divided twice.
Term
mitosis
Definition
the part of the eukaryotic cell cycle in wich chromotids are seperated and 2 nucleui are formed
Term
mutation
Definition
a change in the type or order of the base in an organisms dna: deletion, insertion, or substitution are the 3 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 organisms appearance
Term
recessive trait
Definition
a trait that is apparent only when 2 recessive alleles for the same characteristics are inherited
Term
sexual reproduction
Definition
reproduction that requires 2 parents and produces offspring that will share characteristics from both parents
Term
traits
Definition
different forms of a characteristic
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