Chapter 4 Genetic Inheritance Terminologies

Locus

Dominant allele

Heterozygous

Homozygous recessive

Allele

Test-cross

Genotype

Homozygous

Recessive allele

Gene

Self-cross

Homozygous dominant

Phenotype

The observable characteristic of an organism. Example: plants with 'tt' would appear dwarf.

Organism with dominant phenotype would have a ____ of either TT or Tt; whilst the recessive would have tt.

A cross between individuals from the same generation

Allele that is expressed regardless of its presence in homozygous or heterozygous condition

Allele that is only expressed in homozygous condition, and will be masked in heterozygous condition

Having identical alleles at a locus on a pair of homologous chromosome. Example: TT or tt

Specific position of a gene on a chromosome

An organism inherits two copies of ____, one from each parent

It determines a particular characteristic in an organism

A cross between individual of dominant phenotype but unknown genotype, with a homozygous recessive individual