Quantifying partial migration with sex-ratio balancing

Sex-ratio distortion driven by migration loads.

The significance of migration load in driving the evolution of recipient populations has long been documented in population genetics, but its effects have not been linked to the formation of biased sex ratios in natural populations. In this study, we develop a single-locus model to demonstrate how the migration load can shape the primary and secondary sex ratios in dioecious plants where sexual...

Evolution of the Breeding Sex Ratio under Partial Sex Change.

ZIMMER, E. A., AND K. J. NEWTON. 1982. A simple method for the isolation of high molecular weight DNA from individual maize seedlings and tissues, pp, 165-168. In W. F. Sheridan (ed.), Maize for Biological Research. Plant Molecular Biology Assoc., Charlottesville, VA. ZIMMER, E. A., E. R. lUPE,AND V. E. WALBOT. 1988. Ribosomal gene structure, variation and inheritance in maize and its ancestors...

Survey of Sex Ratio with Intracytoplasmic Sperm Injection

Abstract Introduction: In different studies worldwide, gender ratios derived from ICSI (Assisted reproductive techniques) have been reported differently. Objective: Evaluation of neonatal gender in ICSI women referred to Mehr Infertility Research Center of Rasht. Materials and Methods: In this descriptive-analytical study, the cases of infertile women referred to Mehr Infertility Research Ce...

Partial local mating and the sex ratio: indirect comparative evidence.

Population models with partial migration

Populations exhibiting partial migration consist of two groups of individuals: Those that migrate between habitats, and those that remain fixed in a single habitat. We propose several discrete-time population models to investigate the coexistence of migrants and residents. The first class of models is linear, and we distinguish two scenarios. In the first, there is a single egg pool to which bo...