Genitics-vocab (inheritence)

14 terms by agroves

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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

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