IB Biology Sub-topic D3.2 Definitions

An individual that is heterozygous for a genetic disease

An inherited genotype of two dominant alleles that express a joint phenotype

The division of characteristics into an infinite number of forms

The division of characteristics into a finite number of different groups

An allele who's phenotype is expressed over a recessive allele. Dominant alleles are capitalized (A)

The alleles than an organism contains to exhibit a characteristic

The presence of two different alleles (Aa)

The presence of two of the same alleles (AA or aa)

Genes that are on the same chromosome

A specific position on a chromosome

A substance capable of causing a mutation

A random change to the base sequence of a gene

Genes that are on different chromosomes

The characteristic physically exhibited by an organism

The inheritance of multiple genes coding for a single characteristic

An allele who's phenotype is masked by a dominant allele. Recessive alleles are lowercase (a)

A new combination of linked genes made via recombinatinon during crossing over in prophase I

The phenomenon of offspring inheriting one allele from each parent due to the formation of haploid nuclei during meiosis

A condition dependent on the sex of the individual because the allele is present on the X chromosome