Premium
HOMOEOLOGOUS CHROMOSOME PAIRING AND RESTRICTED SEGREGATION IN THE FERN CERATOPTERIS
Author(s) -
Hickok Leslie G.
Publication year - 1978
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1978.tb06102.x
Subject(s) - biology , gametophyte , sporophyte , fern , polyploid , ploidy , genetics , meiosis , pairing , chromosome , botany , locus (genetics) , chiasma , chromosome pairing , chromatid , gene , pollen , superconductivity , physics , quantum mechanics
The segregation of a marker characterized by pale green gametophytes was monitored within an inbreeding study of the polyploid fern Ceratopteris . Although all of the sporophytes showing segregation were derived from the self‐fertilization of haploid gametophytes, a low overall frequency of 2.5% pale gametophytes was observed in the F 3 –F 5 generations. A model based upon a duplicated locus and homoeologous chromosome pairing can explain the segregational behavior within the study. The overall level of homoeologous pairing was determined to be 10%. Occasionally, green gametophytes that were presumably heterozygous for the marker contained pale sectors. This behavior may involve mitotic crossing‐over between homoeologous chromosomes.