منابع مشابه
Inbreeding effects on progeny sex ratio and gender variation in the gynodioecious Silene vulgaris (Caryophyllaceae).
In gynodioecious species, sex expression is generally determined through cytoplasmic male sterility genes interacting with nuclear restorers of the male function. With dominant restorers, there may be an excess of females in the progeny of self-fertilized compared with cross-fertilized hermaphrodites. Moreover, the effect of inbreeding on late stages of the life cycle remains poorly explored. H...
متن کاملFurther concepts on regulators of the sex ratio in human offspring. Non-optimal maturation of oocytes and the sex ratio.
Introduction In a prospective analysis on women who had discontinued contraception to start pregnancy, Weinberg et al. (1995) uncovered new data on the notion of why some conceptions result in boys, while others result in girls. The length of the follicular phase (from the onset of the menses to ovulation) was found to be related to the sex of the baby in 133 pregnancies that survived to delive...
متن کاملEvolution On the optimal sex ratio ( optimality / evolutionary stability )
The equilibrium structures for various multiallele sex-determining genetic models of panmictic populations with sex expression depending on the genotypes of either the zygote or a parent are described. Even-sex-ratio equilibrium surfaces can exist apart from equilibrium points having coincident male and female allelic frequency sets. The latter (symmetric) equilibrium states entail biased sex r...
متن کاملNucleotide diversity in Silene latifolia autosomal and sex-linked genes.
The plant Silene latifolia has separate sexes and sex chromosomes, and is of interest for studying the early stages of sex chromosome evolution, especially the evolution of non-recombining regions on the Y chromosome. Hitch-hiking processes associated with ongoing genetic degeneration of the non-recombining Y chromosome are predicted to reduce Y-linked genes' effective population sizes, and S. ...
متن کاملThe effects of stigma age on receptivity in Silene alba (Caryophyllaceae).
Silene alba, a perennial, dioecious plant, produces flowers that open in the evening and can remain open and receptive to pollination for up to 5 d, though in hot and dry conditions the flowers will wilt during the day only to reopen night after night. In the field, it is visited by two different kinds of pollinators with differential success: moths visit the flowers at night, and their movemen...
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ژورنال
عنوان ژورنال: Heredity
سال: 1967
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1967.50