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Biology Chapter 6
the scientific study of heredity
a characteristic that can be passed from parent to offspring
a plant or organism that receives the same genetic traits from both of its parents.
an organism that receives different forms of a genetic trait from each parent
sections of a chromosome that code for a trait
a distinct form of a gene
a form of a gene that is fully expressed when two different alleles are present
a form of a gene that is not expressed when paired with a dominant allele
Chromosome theory of heredity
states that the material of inheritance is carried by the genes in chromosomes
the genetic make up of an organism
The outward expression of the trait in an organism
an organism in which the two alleles in a gene pair are identical
an organism in which the two alleles for a particular trait are different
a grid for organizing genetic information
when geneticists breed the organism whose genotype is unknown with a homozygous recessive organism
a chart that shows how a trait and the genes that control it are inherited within a family
an individual who carries a recessive trait that is not expressed
When two different alleles for the same trait combine but neither allele "wins" expression over the other, the offspring have a form of intermediate inheritance
both alleles in the heterozygote express themselves fully
a trait controlled by two or more genes
if three or more alleles are found in the population
When a single gene affects more than one trait