chapter 14 biology 101 KD
Terms
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- alternative versions of a gene
- allele
- heterozygotes display an intermediate phenotype not seen in parental generation
- incomplete dominance
-
two alleles affect a phenotype in separate, distinguishable ways
example: blood group - codominance
- a gene at one locus alters the phenotypic expression of a gene at a second locus
- epistasis
-
an additive effect of two or more genes on a phenotypic character
ex. skin color - polygenic inheritance
- a heritable unit that determines a character; can exist in different forms
- gene
- an alternative version of a gene
- allele
- a heritable feature that varies among individuals
- character
- a variant for a character
- trait
- determines phenotype in a heterozygote
- dominant allele
- has no effect on phenotype in a heterozygote
- recessive allele
- the genetic make up of an individual
- genotype
- an organisms appearance or observable traits
- phenotype
- having two identical alleles for a gene
- homozygous
- having two different alleles for a gene
- heterozygous
- a cross between an individual with an unknown genotype and a homozygous recessive individual
- testcross
- a cross between individuals heterozygous for a single character
- monohybrid cross