Sperm competition and sperm cooperation: the potential role of
... Sperm cooperation can be defined as the partitioning of function and/or the mutual interaction between sperm of one male (i.e. sibling sperm) to increase a male’s fertilisation success. The partitioning of function among sibling sperm entails four non-exclusive scenarios which lead to fundamentally ...
... Sperm cooperation can be defined as the partitioning of function and/or the mutual interaction between sperm of one male (i.e. sibling sperm) to increase a male’s fertilisation success. The partitioning of function among sibling sperm entails four non-exclusive scenarios which lead to fundamentally ...
Why do sperm carry RNA? Relatedness, conflict
... genotype [36]. Hence, there is potential for directly displaying attributes that signal relatedness or shared genes, and differences in miRNA expression are associated with different sperm phenotypes [9]; thus, it is plausible that sperm phenotypes could reveal information about sperm relatedness. C ...
... genotype [36]. Hence, there is potential for directly displaying attributes that signal relatedness or shared genes, and differences in miRNA expression are associated with different sperm phenotypes [9]; thus, it is plausible that sperm phenotypes could reveal information about sperm relatedness. C ...
Location and behavior of dorsal determinants during
... from the vegetal pole to the dorsal region, keeping themselves as a small aggregate, or whether the two sets of components detected in the two regions before or after cortical rotation are identical or not. As an approach to answer these questions, we have devised an assay system for following the l ...
... from the vegetal pole to the dorsal region, keeping themselves as a small aggregate, or whether the two sets of components detected in the two regions before or after cortical rotation are identical or not. As an approach to answer these questions, we have devised an assay system for following the l ...
Effect of cooling and freezing, the two first steps
... for 6 or 8 h at 5 ºC before being used for insemination; the percentage of does kidding was 67%, with 6.5 rabbits/female kidding, but no females were inseminated with fresh sperm for comparison. Maurer et al. [9], used the same extender as Stranzinger et al. [18], and they compared the results for s ...
... for 6 or 8 h at 5 ºC before being used for insemination; the percentage of does kidding was 67%, with 6.5 rabbits/female kidding, but no females were inseminated with fresh sperm for comparison. Maurer et al. [9], used the same extender as Stranzinger et al. [18], and they compared the results for s ...
1 Biology 4361 Developmental Biology Fertilization October 19
... - extends microtubules and integrates them with egg microtubules to form an aster - microtubules extend throughout the egg and contact the female pronucleus - the two pronuclei migrate toward each other - fusion forms diploid zygote nucleus - DNA synthesis can begin either in the pronuclear stage (d ...
... - extends microtubules and integrates them with egg microtubules to form an aster - microtubules extend throughout the egg and contact the female pronucleus - the two pronuclei migrate toward each other - fusion forms diploid zygote nucleus - DNA synthesis can begin either in the pronuclear stage (d ...
197 THE ROLE OF Ca2+ IN SIGNAL TRANSDUCTION FOLLOWING
... Fertilization of a large non-motile egg by a smaller motile sperm is a common reproductive strategy amongst multicellular animals and plants. Egg activation represents the sequence of events leading to the initiation of development of the egg. Activation events have been extensively characterized in ...
... Fertilization of a large non-motile egg by a smaller motile sperm is a common reproductive strategy amongst multicellular animals and plants. Egg activation represents the sequence of events leading to the initiation of development of the egg. Activation events have been extensively characterized in ...
Reproduction - Male
... *This figures depend upon the overall health and freedom from disease and parasites as well as nutrition of the individual. ...
... *This figures depend upon the overall health and freedom from disease and parasites as well as nutrition of the individual. ...
Fertilization - Formatted
... specific. The sperms are delivered directly to the eggs immediately after laying. In marine forms the time interval between shedding of gametes may be longer by weeks or months. The task of meeting sperm and egg is further intensified as they release their gametes into the open sea, where they are ...
... specific. The sperms are delivered directly to the eggs immediately after laying. In marine forms the time interval between shedding of gametes may be longer by weeks or months. The task of meeting sperm and egg is further intensified as they release their gametes into the open sea, where they are ...
A profile of fertilization in mammals
... found exclusively as components of the egg ZP, proteins with homologous sequences are widely distributed in nature (Fig. 2). Today, mZP3 is designated as a sperm receptor on the basis of several lines of evidence5,11. Paramount among these is the ability of nanomolar concentrations of purified egg m ...
... found exclusively as components of the egg ZP, proteins with homologous sequences are widely distributed in nature (Fig. 2). Today, mZP3 is designated as a sperm receptor on the basis of several lines of evidence5,11. Paramount among these is the ability of nanomolar concentrations of purified egg m ...
DEVELOPMENTAL BIOLOGY 5 FERTILIZATION
... the egg. The polyspermy is blocked in many animals as soon as the first sperm fuses with the egg plasma membrane. The sea urchin egg has evolved two mechanisms to avoid polyspermy, a) fast reaction that is accomplished b yan electric change in the egg plasma membrane and b) a slower reaction caused ...
... the egg. The polyspermy is blocked in many animals as soon as the first sperm fuses with the egg plasma membrane. The sea urchin egg has evolved two mechanisms to avoid polyspermy, a) fast reaction that is accomplished b yan electric change in the egg plasma membrane and b) a slower reaction caused ...
developmental biology 5 fertilization Introduction: Special features of
... 1. Recognition of egg and sperm (approach of spermatozoan to the egg, attachment and binding) 2. Acrosome reaction and penetration 3. Fusion of plasma membranes of egg and spermatozoa. 4. Activation of egg 5. Fusion of egg and sperm pronuclei 1. Recognition of Egg and Sperm: Encounter of spermatozoa ...
... 1. Recognition of egg and sperm (approach of spermatozoan to the egg, attachment and binding) 2. Acrosome reaction and penetration 3. Fusion of plasma membranes of egg and spermatozoa. 4. Activation of egg 5. Fusion of egg and sperm pronuclei 1. Recognition of Egg and Sperm: Encounter of spermatozoa ...
what determines sex roles in mate searching?
... In both models, we assume that females and males are free to invest any amount of effort (i.e., zero or positive) into mate searching. We denote this investment by x for females and y for males. Investment in mate searching is assumed to increase the rate with which the searching individual finds me ...
... In both models, we assume that females and males are free to invest any amount of effort (i.e., zero or positive) into mate searching. We denote this investment by x for females and y for males. Investment in mate searching is assumed to increase the rate with which the searching individual finds me ...
Mate choice inside an egg cell.
... his ideas to account for elaborate pre-copulatory sexual displays and preferences, his ideas have since been expanded to include forms of post-copulatory choice, such as sperm competition (Parker 1970) and cryptic female choice (Thornhill 1983). Sperm competition occurs when sperm from multiple male ...
... his ideas to account for elaborate pre-copulatory sexual displays and preferences, his ideas have since been expanded to include forms of post-copulatory choice, such as sperm competition (Parker 1970) and cryptic female choice (Thornhill 1983). Sperm competition occurs when sperm from multiple male ...
Eulachon of the Pacific Northwest
... grasses, provide shelter from predators and opportunities to forage for food. Eulachon typically enter their juvenile stage of life (8 weeks to 12 months) in this estuarine environment. At this stage they resemble adult fish more than the larval appearance they had when they hatched. They also devel ...
... grasses, provide shelter from predators and opportunities to forage for food. Eulachon typically enter their juvenile stage of life (8 weeks to 12 months) in this estuarine environment. At this stage they resemble adult fish more than the larval appearance they had when they hatched. They also devel ...
Reptiles and Birds
... The shell and membranes protect the embryo and prevent the egg from drying out. This type of egg, an amniotic egg, is one of the most important adaptations to life on land. An amniotic egg has four membranes—the amnion, the yolk sac, the chorion, and the allantois. ...
... The shell and membranes protect the embryo and prevent the egg from drying out. This type of egg, an amniotic egg, is one of the most important adaptations to life on land. An amniotic egg has four membranes—the amnion, the yolk sac, the chorion, and the allantois. ...
Document
... Sperm is stored in a sac (spermatophore) and deposited into the genital bursa of the female. The female then controls the release of a few sperm to fertilize her eggs at the moment they are laid, using the ovipositor. ...
... Sperm is stored in a sac (spermatophore) and deposited into the genital bursa of the female. The female then controls the release of a few sperm to fertilize her eggs at the moment they are laid, using the ovipositor. ...
Infertility
... This Act defines infertility as, "the condition of a presumably healthy individual who is unable to conceive or produce conception or sustain a successful pregnancy during a one year period". HCT covers the medical necessary expenses for the diagnosis of infertility for both males and females HCT pr ...
... This Act defines infertility as, "the condition of a presumably healthy individual who is unable to conceive or produce conception or sustain a successful pregnancy during a one year period". HCT covers the medical necessary expenses for the diagnosis of infertility for both males and females HCT pr ...
Patient Information For Egg Donors And Donor Egg
... Recipients are asked what characteristics are important when choosing a donor. These usually include physical characteristics such as hair color, eye color, height, weight, build, complexion, race, blood type and family medical background. All matched are confidential. A number system is used to mai ...
... Recipients are asked what characteristics are important when choosing a donor. These usually include physical characteristics such as hair color, eye color, height, weight, build, complexion, race, blood type and family medical background. All matched are confidential. A number system is used to mai ...
Full text in pdf format
... reproductive activities, and the index of pleonal expansion (PE) can be employed as a morphological criterion for selecting females that are able to mate (Sato & Yoseda 2009b). Coconut crabs have 4 tergites, and the distance between the tergites increases when the pleon becomes enlarged. Thus the PE ...
... reproductive activities, and the index of pleonal expansion (PE) can be employed as a morphological criterion for selecting females that are able to mate (Sato & Yoseda 2009b). Coconut crabs have 4 tergites, and the distance between the tergites increases when the pleon becomes enlarged. Thus the PE ...
Age and Fertility
... and motherhood. The child, however, will be not be genetically related to you but will be related to the father and the egg donor. Many programs recommend counseling so that all parties in a donor egg agreement understand the ethical, legal, psychological, and social issues involved. There are many ...
... and motherhood. The child, however, will be not be genetically related to you but will be related to the father and the egg donor. Many programs recommend counseling so that all parties in a donor egg agreement understand the ethical, legal, psychological, and social issues involved. There are many ...
The Program of and Mechanisms of Fertilization in the Echinoderm
... marks a turning point between life and death. Life if a successful fertilization occurs, since the resultant sperm-egg interaction will initiate the programmed development of a new individual. Death in the absence of such interaction, since the unfertilized egg will soon degenerate. For studies of f ...
... marks a turning point between life and death. Life if a successful fertilization occurs, since the resultant sperm-egg interaction will initiate the programmed development of a new individual. Death in the absence of such interaction, since the unfertilized egg will soon degenerate. For studies of f ...
Miquela Research Poster Final
... many embryos in a short amount of time, the amount of time between fertilization and hatching is between three and six days, and their translucent bodies during development allow for observations that would be difficult to analyze in other species. Zebrafish contain many conserved genes that are sim ...
... many embryos in a short amount of time, the amount of time between fertilization and hatching is between three and six days, and their translucent bodies during development allow for observations that would be difficult to analyze in other species. Zebrafish contain many conserved genes that are sim ...
REPRODUCTION - Teaching Biology Project
... Any pattern of behaviour in which parent spends time or energy to improve the 1survival, 2condition and 3future reproductive success of offspring. Care can be given at any stage: 1. Prenatal – guarding eggs, building nests, carrying broods, incubating eggs and ...
... Any pattern of behaviour in which parent spends time or energy to improve the 1survival, 2condition and 3future reproductive success of offspring. Care can be given at any stage: 1. Prenatal – guarding eggs, building nests, carrying broods, incubating eggs and ...
reproduction - Teaching Biology Project
... Any pattern of behaviour in which parent spends time or energy to improve the 1survival, 2condition and 3future reproductive success of offspring. Care can be given at any stage: 1. Prenatal – guarding eggs, building nests, carrying broods, incubating eggs and ...
... Any pattern of behaviour in which parent spends time or energy to improve the 1survival, 2condition and 3future reproductive success of offspring. Care can be given at any stage: 1. Prenatal – guarding eggs, building nests, carrying broods, incubating eggs and ...
Reproductive Ecology of the Green Treefrog (Hyla cinerea) in Northwestern Florida
... I sampled four localities in Leon County, Florida, over three Hyla cinerea breeding seasons (2001-2003). Three of these localities (Chapman Pond, 1 ha; Harriman Pond, 0.56 ha; and Innovation Pond, 1.4 ha) were suburban ponds surrounded by mowed grass, trees and shnibs, with relatively sparse emergen ...
... I sampled four localities in Leon County, Florida, over three Hyla cinerea breeding seasons (2001-2003). Three of these localities (Chapman Pond, 1 ha; Harriman Pond, 0.56 ha; and Innovation Pond, 1.4 ha) were suburban ponds surrounded by mowed grass, trees and shnibs, with relatively sparse emergen ...
Spawn (biology)
Spawn is the eggs and sperm released or deposited, usually into water, by aquatic animals. As a verb, spawn refers to the process of releasing the eggs and sperm, also called spawning. Most aquatic animals, apart from aquatic mammals, reproduce through a process of spawning.Spawn consists of the reproductive cells (gametes) of aquatic animals, some of which will become fertilized and produce offspring. The process of spawning typically involves females releasing ova (unfertilized eggs) into the water, often in large quantities, while males simultaneously or sequentially release spermatozoa (milt) to fertilize the eggs.Most fish reproduce by spawning, and so do most other aquatic animals, including crustaceans such as crabs and shrimps, molluscs such as oysters and squid, echinoderms such as sea urchins and sea cucumbers, amphibians such as frogs and newts, other amphibious animals such as turtles, aquatic insects such as mayflies and mosquitoes, and corals (which are small aquatic animals and not plants). Fungi, such as mushrooms, are also said to ""spawn"" a white fibrous matter that forms the matrix from which they grow.There are many variations in the way spawning occurs, depending on sexual differences in anatomy, on how the sexes relate to each other, on where and how the spawn is released, and on whether or how the spawn is subsequently guarded.