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27 Cards in this Set

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  • Back
allele
an alternative form of the same gene
autosome
a type of chromosome that does not directly determinean aorganism's sex
character
a characteristic of that organism; trait
trait
a characteristic of that organism; character
codominance
two alleles both contribute to the phenotype, so that heterozygote has an intermediate phenotype
diploid
two copies of each type of chromosome
chromosomes
structures in the nucleus of eukaryotic cells that carry genetic material (DNA)
dominant
an allele that determines the phenotype that is expressed whne paired with another allele (recessive allele)
frequency
the ratio of the # of times an event occurs to the times it could potentially occur
gene
a DNA sequence at a particular location (locus) on a chromosome
genotype
describes the alleles that an individual has at one or more genetic loci
haploid
an organism with one copy of each type of chromosome
heterozygote
an individual with two different alleles at the same genetic locus on its homologous chromosomes
homozygote
an individual with the same allele at the same genetic locus on its homologous chromosome pair
locus
a location on a chromosome that contains a particular gene
phenotype
the traits or characteristics of an individual
recessive
an allele which is not expressed if heterozygous with another allele
somatic
pertaining to the body
allele frequency
the ratio of the # of alleles of a particular type at a genetic locus to the total number of alleles at that genetic locus in that population
distribution
a summary of the values of a phenotypic trait for the members of a population; illustrated with histograms
emigration
the movement of individuals out of a population
founder effect
a reduction in population size that occurs when one (or a few) members from a source population establishes a new population at a new location
gene pool
all of the genetic loci and alleles at those loci for the members of a particular population
genotype frequency
the ratio of the number of individuals with a particular genotype to the total number of individuals in that population
immigration
the movement of individuals into a population
phenotype frequency
the ratio of the number of individuals with a particular phenotype to the total number of individuals in that population
population
a group of individuals who are likely to breed with one another, but who are unlikely to breed with the members of other populations