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History of genetics
Learn introductory genetics with Braimy- B.Sc agriculture
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Depending on absence or presence of recombinant phenotype:

a) Complete linkage

  • The genes located on the same chromosome do not separate and are inherited together over the generations due to the absence of crossing over.
  • Complete linkage allows the combination of parental traits to be inherited as such.
  • It is rare but has been reported in male Drosophila and some other heterogametic organisms.

b) Incomplete linkage

  • Genes present in the same chromosome have a tendency to separate due to crossing over and hence produce recombinant progeny besides the parental type.
  • The number of recombinant individuals is usually less than the number expected in independent assortment

Depending on whether all or some dominant and some recessive genes are linked together:

i) Coupling phase of linkage: Dominant alleles of the linked genes are present in the same chromosome. Eg: Colored full/ color less sunken genes in maize.

ii) Repulsive phase of linkage: Dominant alleles of some genes and recessive alleles of other gene are present in the same chromosome. Eg: Colored shrunken/ color less full genes in maize.

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