Open AccessA comparison of spermatogenesis in homozygotes, simple Robertsonian heterozygotes and complex heterozygotes of the common shrew ( Sorex araneus L .)
Author(s) -
Banaszek Agata,
Fedyk Stanisław,
Szałaj Katarzyna A.,
Che¸tnicki Włodzimierz
Publication year - 2000
Publication title -
heredity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.441
H-Index - 118
eISSN - 1365-2540
pISSN - 0018-067X
DOI - 10.1046/j.1365-2540.2000.00701.x
Subject(s) - sorex , biology , araneus , heterozygote advantage , shrew , genetics , meiosis , karyotype , somatic cell , spermatocyte , chromosome , spermatogenesis , zoology , genotype , gene , endocrinology
Spermatogenesis was studied in 56 shrews ( Sorex araneus L.) from two chromosomal hybrid zones in Poland. The hybrid zones were formed between chromosome races that differed in Robertsonian metacentrics. Shrews were compared in four classes: homozygotes, simple Robertsonian heterozygotes, complex heterozygotes forming four‐element rings in meiosis I, and complex heterozygotes forming four‐ or five‐element chains. There was a significant effect of karyotype on the level of germ‐cell death and chain‐forming complex heterozygotes suffered the greatest germ‐cell loss. However, the estimated level of germ‐cell death is probably insufficient to influence the fertility of these males.