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katherine glasser
from the science exam study guide.
16
Science
7th Grade
12/12/2011

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Cards

Term

what is the chromosome theory of inheritance?

 

 

Definition
genes are carried from parents to offspringon chromosomes.
Term
walter sutton discovered that the sex cells of grasshoppers have__________.
Definition
half the # of chromosomes found in body cells.
Term
what happens during meiosis?
Definition
chromosome pairs seperate and are distributed into new sex cells.
Term
when sex cells combine to produce offspring each cell will contribute____________.
Definition
half the # of chromosomes in body cells
Term
whar determines genetic code?
Definition
the order of nitrogen bases along a gene
Term
what does messanger RNA do during protein synthesis?
Definition
copies coded message from DNA and carries it into the cytoplasm.
Term
what do transfer RNA molecules do during protein synthesis?
Definition
carry amino acids and add them to the growing protein.
Term
what is a mutation?
Definition
a change in a gene or chromosome
Term
a mutation is harmful to an organism if it __________.
Definition
reduces the chances of the organism's survival and reproduction
Term
which term refers to the physical characteristics that are studies in genetics?
Definition
traits
Term
the di
Definition
Term
the diffrent forms of a gene are called __________.
Definition
alleles.
Term
chromosmes are made up of ___________.
Definition
many genes joined together
Term
in a scientific experiment a statement that describes how to measure a particular variable or define a particular term is a(n)______________________.
Definition
operational definition
Term
scientists can communicate their results ____________.
Definition
1)at scientific meetings 2)in scientific journals 3)by exchanging information over the internet
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