Science chapter 4 7th grade

character

A characteristic of a species such as as size.

trait

A form of character such as tall or short.

purebred

An organism that always produces decedents 

hybrid

An organism with a mix of alleles for a specific  charater.

dominant trait

A trait for a specific character that appears

recessive trait

A trait of a specific character that is hidden by the dominant trait in a hybrid organism.

simple dominance 

A pattern of inheritence in which there are only two alleles and the dominant is always expressed in a hybri

heredity

The study of how traits are passed down from generation to the next.

genotype

The letters that symbolize an organism’s alleles for a specific gene

phenotype

The trait that an organism expresses as determined by its genotype.

incomplete dominance

A pattern of inheritance in a hybrid in which traits are blended together.

codominance

A pattern of inheritance in a hybrid in which both traits are present but not blended.

polygenic inheritance

A pattern of inheritance that occurs when two or more genes interact to control a single character.

genectic drift

A natural process in which the ratio of alleles in population changes randomly over time.

adaptation

An inherited trait that helps an animal survive to reproduce.

natural selection

The process through which organisms with organisms with certain adaptions survive to pass on their traits to a greater number of offspring than other organisms do.