BACKGROUND Although gamete receipt or donation has become an integral part of infertility management, previous research in the field of social attitudes and intention to use medical technologies is limited. The aim of this paper was to investigate people's intentions to receive or donate sperm, oocyte or uterus (surrogacy) and to identify possible motivational patterns explaining this intention...

1. Use of family members as donors or surrogates is generally ethically acceptable. 2. Brothers may donate sperm to brothers and sisters may donate eggs to sisters. 3. Intergenerational gamete donation and surrogacy are especially challenging. 4. Consanguineous gamete donations from first-degree relatives are unacceptable. 5. Counseling is encouraged for all parties including partners of donors...

1. Abstract 2. Introduction 2.1. Definition: purification versus complementation 2.2. Mutations 3. Some computer models 3.1. Emerging complementarity 3.2. Gamete recognition 3.3. Role of mutational pressure on the emerging of complementarity 3.4. The role of inbreeding 4. Consequences 4.1. Sympatric speciation 4.2. Distribution of recombination events 4.3. Effect of gamete recognition 5. Discus...

Abstract The evolution of gametic sex (meiosis and fertilization) subsequent transition from isogamy (fusion between two equal-sized gametes) to anisogamy (dimorphism into eggs sperm, namely, females males) is one the largest enigmas evolutionary biology. Meiosis entails genome-dilution cost male-production cost. Despite much progress has been made for maintenance mechanisms sex, its originatio...

Anisogamy is the occurrence within a population of two gamete types of different size, a very common condition both in plants and in animals. This paper shows conditions that anisogamy without disassortative fusion (pseudoanisogamety) should be favoured by individual natural selection; the results obtained analytically below are in basic agreement with those obtained through the use of numerica...

One of the distinction between an ethical proposition and a proposition in Islamic Jurisprudence (Feqh) or Islamic Law is in their predicates. All three speak of the free action of human being as their subjects. Nature of human being discussed in this article according to Islamic point of view. Status of a gamete and nature of human being correlated to each other and affect to the conclusion. H...