Ten models for inheritance of dominant markers in triploid Erigeron

Probabilities for dominant markers
Single dose
1. (Aaa) trisomic, chromosome, neutral1/32/3
2. (Aaa) trisomic, chromosome, selectiona02/3
3. (Aaa) trisomic, chromatid, neutral1/39/15
4. (Aaa) trisomic, chromatid, selectiona08/14
5. (Aa) disomicb, chromosome, neutral1/21/2
6. (Aa) disomicb, chromosome, selectiona01/2
Double dose
7. (AAa) trisomic, chromosome, neutral2/31
8. (AAa) trisomic, chromosome, selectiona; or univalentc01
9. (AAa) trisomic, chromatid, neutral2/314/15
10. (AAa) trisomic, chromatid, selectiona08/9
  • Probabilities calculated for haploid and diploid gametes produced by a triploid pollen donor.

  • a Models with selection assume complete elimination of gametes bearing either a single (A) or double dose (AA) of an allele in the absence of a wild-type (a) allele.

  • b Disomic models assume complete preferential pairing of two homologs to the exclusion of a third univalent.

  • c Our assumption is that a nonrecombining univalent will segregate with one or the other preferentially pairing homolog. The inheritance of markers on a univalent is coincidentally equivalent to that of double-dose markers under complete recessive lethal-gametophytic selection.