Search for dissertations about: "sperm"
Showing result 1 - 5 of 142 swedish dissertations containing the word sperm.
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1. Selection in sperm and its consequences : Exploring haploid selection, ageing and epigenetic effects in sperm
Abstract : Sexually reproducing eukaryotes are typically going through a biphasic life cycle with a diploid and a haploid phase. Unlike in plants where selection on haploid pollen genotypes is well established, the possibility of selection occurring in animal sperm is currently not known. READ MORE
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2. Sperm Whales : Social Organization and Global Genetic Structure
Abstract : The social organization of most mammals is characterised by female philopatry and male dispersal. This thesis examines the social organization of sperm whales, Physeter macrocephalus, using a combination of field observations and molecular genetic techniques. READ MORE
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3. Sex, Sperm and Speciation : On sexual selection and fertility in hybridizing flycatchers
Abstract : Sexual reproduction entails complex co-evolution between the sexes, necessary for successful fertilization, ensuring individual and population-level fitness. Interfertility is the main criterion for species definition and understanding speciation requires detailed studies of reproductive barriers. READ MORE
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4. EXPOSURE TO PERSISTENT ORGANOCHLORINE POLLUTANTS AND MALE SEMEN FUNCTION
Abstract : Persistent organochlorine pollutants (POPs), such as polychlorinated biphenyls (PCB) and the insecticide dichloro-diphenyl-dichloro-ethylene (DDT) have been released into the environment mainly since the second World War. POPs accumulate especially in highly ranked predators of the aquatic food chain. READ MORE
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5. Same, same but different : lesbian couples undergoing sperm donation
Abstract : Introduction: The desire to have children and form a family is for many people central for life fulfilment and the desire does not differ by sexual orientation. Due a series of societal changes during the last decade, today we see a lesbian baby boom. READ MORE