TABLE 1

Mitotic and meiotic changes in repeat tract lengths

Tract configurationNo. of tetradsMitotic changes (all in long tract)Meiotic changes in long tractMeiotic changes in short tract/no tract
ExpansionsContractionsExpansionsContractionsConversionsExpansionsContractionsConversions
C78/Cii28250110212a012c
C78/no tract25614122b2d
D71/Dii28223246030000
D71/no tract2561342101e
  • a In these events C78 was replaced by Cii28 (events 3 and 6, Table 2).

  • b In these events C78 was eliminated (events 13 and 14, Table 2).

  • c In one of these events, Cii28 was replaced by C78, and in the other event Cii28 was replaced by an uninterrupted tract longer than C78 (events 7 and 1, respectively, Table 2).

  • d In these events a chromosome lacking a repeat tract acquired tract C78 (events 11 and 12, Table 2).

  • e In this event a chromosome lacking a repeat tract acquired an uninterrupted tract longer than D7l (event 21, Table 2).