Heterozygosity for recessive lethals in homosporous fern populations: Thelypteris palustris and Onoclea sensibilis
Heterozygosity for recessive lethals in homosporous fern populations: Thelypteris palustris and Onoclea sensibilis
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同孢蕨类种群隐性致死的杂合性：Thelypteris palustris 和 Onoclea sensibilis
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
F. R. Ganders
中科院分区：
文献类型：
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作者：
F. R. Ganders
Sporophytes from natural populations of Thelypteris palustris and Onoclea sensibilis were subjected to breeding tests to reveal the presence of recessive lethal alleles in their genotypes. All sporophytes were found to be heterozygous for recessive sporophytic lethals. Despite the capability for producing completely homozygous genotypes by intragametophytic self-fertilization, ferns in natural populations seem to retain considerable genetic loads of deleterious recessive alleles. It is suggested that natural selection operates to strongly favour heterozygous rather than homozygous sporophytes under most conditions.
