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genetic couseling words
01/27/10
30
Biology
9th Grade
01/27/2010

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Term
gen
Definition
race, kind
Term
Genotype
Definition
List of the alleles present in an organism
Term
phen
Definition
show, shine
Term
Phenotype
Definition
Physical description of an organism
Term
epi
Definition
on, over
Term
Epistasis
Definition
When one gene masks or covers the expression of another gene
Term
Hetero
Definition
Other, different
Term
Heterozygous
Definition
When an organism has two different alleles for one gene
Term
homo
Definition
same
Term
Homozygous
Definition
When an organism has two similar alleles for one gene
Term
Dominus
Definition
Lord, ruler
Term
Dominant
Definition
When one allele expresses its characteristic in spite of the presence of a different allele (if red is dominant, then a red allele + white allele = red flower)
Term
Incomplete dominance
Definition
When a heterozygous organism displays a blending of both traits (if red and white are co-dominant, then a red allele + white allele = pink flower)
Term
Co-dominance
Definition
When a heterozygous organism displays both of the traits at the same time (if red and white are co-dominant, then a red allele + white allele might produce patches of red and patches of white).
Term
Allele
Definition
one or two alternate forms of a gene that can have the same locus on homologous chromesomes and are responsible for alternative traits.
Term
Gene
Definition
a segment of DNA that is involved in producing a polypeptide chain.
Term
Trait
Definition
a distinguishing feature of your personal nature.
Term
Recessive
Definition
of genes; producing its characteristic phenotype only when its allele is identical.
Term
Enzyme
Definition
any of several complex proteins that are prodced by cells and act as catyalist in specific biochemical reactions.
Term
X-linked (sex-linked)
Definition
relating to genes or characteristics or conditions carried on the x chromosome.
Term
Codon
Definition
a specific sequence of three adjacent bases on a strand of DNA or RNA that provides genetic code information ofr particular amino acid.
Term
Amino acids
Definition
organic compounds containing an amino group and a carboxylic acid group
Term
Transcription
Definition
a record of information.
Term
Translation
Definition
the act of changing.
Term
mRNA (messenger RNA)
Definition
the template for protein synthesis
Term
tRNA (transfer RNA)
Definition
short-chain RNA molecules present in cell. (in atleast 20 variety)
Term
RNA polymerase
Definition
an enzyme that synthesizes the formation of RNA from a DNA template during transcription.
Term
Nucleotides
Definition
any of a group of molecules that, when linked together, form the building blocks of DNA or RNA: composed of a phosphate group, the bases adenine, cytosine, guanine, and thymine, and a pentose sugar, in RNA the thymine base being replaced by uracil.
Term
Ribosome
Definition
an organelle in the cytoplasm of a living cell.
Term
anticodon
Definition
a sequence of three nucleotides in a region of transfer RNA that recognizes a complementary coding triplet of nucleotides in messenger RNA during translation by the ribosomes in protein biosynthesis.
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