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14 terms

Genitics-vocab (inheritence)

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Gene
a region of a chromosome that codes for a specific triat
Allele
a version of a gene
Homozygous
both alleles are the same for a particular gene (TT or tt)
Heterozygous
They have two different alleles for the trait (Tt)
Genotype
the genetic composition of a certain trait (BB)
Phenotype
the physical apperance of a particular trait (Brown eyes)
Dominant
the allele that is phenotypically expressed (T)
Recessive
the allele that is not expressed (t)
Complete Dominance
if two alleles are present the phenotype of only one is expressed (Tall plant height)
incomplete Dominance
if two alleles are present the phenotype expressed is an intermediate of the two (AA=red BB=blue AB=purple)
Co-Dominant
if two alleles are present both phenotypes are expressed (AA=red BB=blue AB=red and blue stripes)
Pedigree
visual representation of the way a gene moves through a family. can be dominant, recessive or sex linked recessive.
Polygene
Where one trait is controlled by more than one gene, e.g. human height and skin color
multiple genes
one of two or more alternative forms of a gene at corresponding sites (loci) on homologous chromosomes
ex. blood type