Genetic terms Flashcards
Genes
A sequence of bases on a DNA molecule that codes for a protein which results in a characteristic
Alleles
A different version of the same gene
Locus/Loci
The fixed position that the allele of each gene is found on each chromosome in a pair
Genotype
The genetic constitution of an organism
Phenotype
The expression of the genetic constitution and its interaction with the environment
Dominant alleles
Always expressed in phenotype, even if there is only one copy
SHOWN BY CAPITAL LETTERS
Recessive alleles
Only expressed if there are two copies present
shown by lower case letters
Codominant alleles
Some alleles are both expressed in the phenotype because neither one is recessive
Homozygous
An organism carries two copies of the same allele
Heterozygous
An organism carries two different alleles for a gene