PPT-Intra-Sexual Selection on sperm in

selfing and outcrossing caenorhabditis nematodes Mating systems Janice Hodges University of Mississippi SPUR 2016 University of Oregon Institute of Evolution and Ecology Patrick Phillips Lab. Evolutionary Mechanisms. Genetic Drift . Migration. Mutations. Natural Selection. Non-adaptive. Adaptive. Natural. . . Selection. (1) Sexual Selection. (2) Constraints on Natural Selection. Pleiotropy. - Recognized as a deviation from predictions offered by a strict selection model. . In this case, there are different selective pressures on each SEX.. Sexual Selection . - Recognized as a deviation from predictions offered by a strict selection model.. Diagnostic genitalia. Sperm competition Odonata . Calopteryx. Nerve and sensory systems: signal generators, signal . receivers. Giant neurons. Cricket sound generation. Cricket sound localization. Diagnostic animal genitalia. Evolutionary Mechanisms. Genetic Drift . Migration. Mutations. Natural Selection. Non-adaptive. Adaptive. Natural. . . Selection. (1) Sexual Selection. (2) Constraints on Natural Selection. Pleiotropy. Selection on Sperm in . Selfing (. Caenorhabditis elegans) . and . Out-Crossing (. C. . . remanei) . Mating . Systems. Janice. . M. . Hodges. 1. , . Katja. Kasimatis. 2. , Patrick C. Phillips. 2. 1. In all . species of animals, including the human species, . sexual behavior is directed by a complex interplay between . hormone . actions in the brain that give rise to sexual . arousal . and . physical experiences . Intersexual and . Intrasexual. Selection. Evolutionary Models of Mate Choice. Learning and Mate Choice. Cultural Transmission and Mate Choice. Male-Male Competition and Mate Choice. I. n 1860, . Charles Darwin wrote in a letter to his friend Asa Gray that “…the sight of a feather in a peacock’s tail, whenever I gaze at it, makes me sick!” Darwin was worried that the peacock’s tail couldn’t possibly help in its survival, and thus could be construed as evidence against his grand theory of evolution by natural selection.. In this case, there are different selective pressures on each SEX.. Sexual Selection . - Recognized as a deviation from predictions offered by a strict selection model.. 1. The Basics. Sexual Selection . Assissted. Reproductive Technology (ART). Artificial insemination (AI). Male infertility factors. Inject the sperm directly in the female reproductive tract (why). Artificial insemination is intra-vaginal or intra- cervical injection/transfer of semen to facilitate fertilization. ). Dr. . . Noori. M . Luaibi. Reproductive and Hormonal Functions of the Male (and Function of the Pineal Gland). The reproductive functions of the male can be divided into three major subdivisions: . (ICSI). ICSI . must. . be. . performed. . after. . 3 . hours. . of. . incubation. : . during. . washing. . of. . sperm. and . capacitation. , the COC’s are . able. . to. . reach. . also. The presence of birefringence is the expression of an organized and very compact texture that characterizes normal sperm nuclei, acrosomes, and motile tails.. On the basis of these considerations, the application of polarization microscopy to the ICSI technique has been proposed as a novel tool for sperm selection, based on the properties of birefringence that human spermatozoa naturally possess.. Recall that sexual reproduction occurs when one haploid . –. the . sperm. . –. fuses together with. another haploid – the . egg. . . Each haploid contains . 23. chromosomes.. When they combine they produce a . HEALTH . – . PROBLEM. . AND. STRATERIES:. The . programme . “family . planning” initiated in. . 1951.. Reproductive . and . child . health . care. . (ACH). Sexually . transmitted diseases. .