Linked genes (loci) where both dominant alleles are positioned on one chromosome and both recessive alleles are positioned on the other chromosome. In other words: one chromosome carries gene combination “AB” and the other chromosome carries gene combination “ab”.
BT: linked genes << coupling phase
RT: crossing-over
Broader Term: linked genes
Repulsion phase
Linked genes (loci) where each chromosome carries a recessive and a dominant allele. In other words: one chromosome carries gene combination “Ab” and the other chromosome carries gene combination “aB”.
BT: linked genes << repulsion phase
RT: crossing-over
Absolutely linked genes
Genes that are positioned so close on the same chromosome, that chances of crossing-over between these genes is virtually zero. Hence recombinant gene combinations do not occur between absolutely linked genes.
Synonyms: linked genes (narrow definition), absolute coupled genes
RT: (broad definition) linked genes >> (narrow definition) absolutely linked genes
ST: coupling phase ↔ repulsion phase
ST: sex-linked genes
RT: crossing-over
RT: pleiotropy