DEFINITION & KEY POINTS OF LINKAGE AND CROSSING OVER

  DEFINITIONS
TERMS
Linkage group A chromosome carries its linked genes en bloc in the form of a linkage group.
Crossing over The exchange of segments between non-sister

chromatids  of    homologous                   chromosomes
during meiosis is called crossing over.

Recombination frequency The proportion of recombinant types between two gene pairs as compared to the sum of all

 

  combinations   is    called    cross  over    or

recombination frequency.

Gene loci The  recombination    frequency  is   directly


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proportional   to the    distance   between the
linked gene loci.

Linkage group A chromosome carries its linked genes en bloc in the form of a linkage group.
Linkage map A linkage map is a chromosome map of a species that shows the position of its known genes or markers relative to each other, rather

than   as specific   physical  points  on  each

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