Carbohydrate-based interactions on the route of a spermatozoon to
... (Figure 2A) to ensure subsequent fertilization (Figure 2A), thereby leaving most of the seminal plasma components behind (Hunter, 1996 and references therein). Seminal plasma appears not to pass through the barrier of the utero-tubal junction, except for those proteins coating the sperm surface. Thi ...
... (Figure 2A) to ensure subsequent fertilization (Figure 2A), thereby leaving most of the seminal plasma components behind (Hunter, 1996 and references therein). Seminal plasma appears not to pass through the barrier of the utero-tubal junction, except for those proteins coating the sperm surface. Thi ...
Sperm competition and sperm cooperation: the potential role of
... fertilisation success. The partitioning of function among sibling sperm entails four non-exclusive scenarios which lead to fundamentally different outcomes: (i) different tasks may be randomly distributed among sibling sperm and every sperm may play any of the roles or (ii) sibling sperm differentia ...
... fertilisation success. The partitioning of function among sibling sperm entails four non-exclusive scenarios which lead to fundamentally different outcomes: (i) different tasks may be randomly distributed among sibling sperm and every sperm may play any of the roles or (ii) sibling sperm differentia ...
Reproduction - Male
... Transmission of nutrients from dam to young. Transmission of wastes from young to dam. Protection of young from shock and adhesions by means of Amniotic Fluid. Prevention of bacteria and other large molecular substances from dam to young. The secretion of certain hormones; HCG (woman) and PMSG (mare ...
... Transmission of nutrients from dam to young. Transmission of wastes from young to dam. Protection of young from shock and adhesions by means of Amniotic Fluid. Prevention of bacteria and other large molecular substances from dam to young. The secretion of certain hormones; HCG (woman) and PMSG (mare ...
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 ...
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 ...
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 ...
Why do sperm carry RNA? Relatedness, conflict
... different sperm phenotypes [9]; thus, it is plausible that sperm phenotypes could reveal information about sperm relatedness. Clearly, this need not be only MHCs (which are vertebrate specific), but merely needs to involve factors that are variable across males, and we note that approximately half o ...
... different sperm phenotypes [9]; thus, it is plausible that sperm phenotypes could reveal information about sperm relatedness. Clearly, this need not be only MHCs (which are vertebrate specific), but merely needs to involve factors that are variable across males, and we note that approximately half o ...
Document
... sneaking male's success in sperm competition will be a function of the interval in sperm release or the distance to the eggs. In the rainbow trout (Oncorhynchus mykiss) the first male sired over 75% of the eggs when sperm of four males were added in 30s intervals [13]. In atlantic salmon (Salmo sala ...
... sneaking male's success in sperm competition will be a function of the interval in sperm release or the distance to the eggs. In the rainbow trout (Oncorhynchus mykiss) the first male sired over 75% of the eggs when sperm of four males were added in 30s intervals [13]. In atlantic salmon (Salmo sala ...
Effect of cooling and freezing, the two first steps
... 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 sperm which had been stored for 5 h at 37 ºC ...
... 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 sperm which had been stored for 5 h at 37 ºC ...
Avoiding bad genes: oxidatively damaged DNA in germ
... Sexual selection may not only act through behaviours leading to differential copulation with the preferred mate, but also across postcopulatory mechanisms after mating with several mates.(68) In that scenario, females should choose among sperm from different males simultaneously (or sequentially) pr ...
... Sexual selection may not only act through behaviours leading to differential copulation with the preferred mate, but also across postcopulatory mechanisms after mating with several mates.(68) In that scenario, females should choose among sperm from different males simultaneously (or sequentially) pr ...
A profile of fertilization in mammals
... proteins and spermadhesins), as well as several other sperm proteins (such as zonadhesin and sperm protein-56 (SP56)). In addition, results of recent experiments with homozygous-null mice have implicated two members of the ADAM (so-called because they contain a disintegrin and a metalloprotease doma ...
... proteins and spermadhesins), as well as several other sperm proteins (such as zonadhesin and sperm protein-56 (SP56)). In addition, results of recent experiments with homozygous-null mice have implicated two members of the ADAM (so-called because they contain a disintegrin and a metalloprotease doma ...
1 Biology 4361 Developmental Biology Fertilization October 19
... - after these 5 steps, sperm and egg pronuclei meet and development is initiated External Fertilization in Sea Urchins Fertilization challenges: - how to bring two very small cell together in a large place - how to ensure that only sperm and eggs of the same species join Sperm attraction: Action at ...
... - after these 5 steps, sperm and egg pronuclei meet and development is initiated External Fertilization in Sea Urchins Fertilization challenges: - how to bring two very small cell together in a large place - how to ensure that only sperm and eggs of the same species join Sperm attraction: Action at ...
In-vitro Fertilisation and Related Treatments
... Alcohol or drug misuse: Funding will be conditional on couples giving an assurance that their alcohol intake is within Isle of Man guidelines and they do not have a current or recent history of substance misuse. This assurance should be included in the provider’s consent form. Any evidence to the co ...
... Alcohol or drug misuse: Funding will be conditional on couples giving an assurance that their alcohol intake is within Isle of Man guidelines and they do not have a current or recent history of substance misuse. This assurance should be included in the provider’s consent form. Any evidence to the co ...
Full text in pdf format
... (17 × 17 × 6 cm, length × width × depth) filled with filtered seawater was also provided for drinking. The light:dark regime matched the natural local conditions with natural light coming through a transparent roof. Mating trials and methods for sperm counts. Female pleonal expansion is strongly cor ...
... (17 × 17 × 6 cm, length × width × depth) filled with filtered seawater was also provided for drinking. The light:dark regime matched the natural local conditions with natural light coming through a transparent roof. Mating trials and methods for sperm counts. Female pleonal expansion is strongly cor ...
Chapter 51
... and blood from ruptured blood vessels are discharged through the vagina. • This process can last about 5 to 7 days until a woman reaches menopause. ...
... and blood from ruptured blood vessels are discharged through the vagina. • This process can last about 5 to 7 days until a woman reaches menopause. ...
Sperm Concentrations and Egg Fertilization Rates
... Clupcu huwigus yulusii and found concentrations of 148 and 129 sperm m - I , which they theorized to be more than ample for high fertilization success.' The sperm densities at which niaxiniuni fertilization occurred in the present study are close to those observed by Hourston aiid Rosenthal, but mag ...
... Clupcu huwigus yulusii and found concentrations of 148 and 129 sperm m - I , which they theorized to be more than ample for high fertilization success.' The sperm densities at which niaxiniuni fertilization occurred in the present study are close to those observed by Hourston aiid Rosenthal, but mag ...
Male reproductive investment and queen mating
... minimal investment in sperm numbers as long as enough can be transferred to guarantee that availability of stored sperm will not limit the life-time reproductive success of a queen mated with—and, (2) their ability to maximize their share in paternity when they cannot prevent their mates from remati ...
... minimal investment in sperm numbers as long as enough can be transferred to guarantee that availability of stored sperm will not limit the life-time reproductive success of a queen mated with—and, (2) their ability to maximize their share in paternity when they cannot prevent their mates from remati ...
Animal Development
... in the egg to fuse with the plasma membrane and discharge their contents. This leads to swelling of the perivitelline space, hardening of the vitelline layer, and clipping of sperm-binding receptors. The resulting fertilization envelope is the slow block ...
... in the egg to fuse with the plasma membrane and discharge their contents. This leads to swelling of the perivitelline space, hardening of the vitelline layer, and clipping of sperm-binding receptors. The resulting fertilization envelope is the slow block ...
Ch 42 Human Reproduction
... released from the ovary. The fallopian tube captures the egg cell at ovulation. The fusion of sperm and egg cell into a zygote is called fertilisation. Fertilisation of the egg cell usually occurs in the Fallopian tube. The ‘fertilised egg’ is carried to the uterus. The ‘fertilised egg’ reaches the ...
... released from the ovary. The fallopian tube captures the egg cell at ovulation. The fusion of sperm and egg cell into a zygote is called fertilisation. Fertilisation of the egg cell usually occurs in the Fallopian tube. The ‘fertilised egg’ is carried to the uterus. The ‘fertilised egg’ reaches the ...
10. Human Reproduction Outline
... _____________ of the fertilized egg begins while the egg is still in the __________. Six to ten days later, the resulting embryo may become ___________ (attached) in the lining of the _________. Fertilization If more than one ______ is released and ___________ at the same time, multiple births ...
... _____________ of the fertilized egg begins while the egg is still in the __________. Six to ten days later, the resulting embryo may become ___________ (attached) in the lining of the _________. Fertilization If more than one ______ is released and ___________ at the same time, multiple births ...
Topic 17: Reproduction
... Contains erectile tissue which has blood cavities, when penis is stimulated blood fills the cavities making the penis long and strong enough for copulation, this is known as erection ...
... Contains erectile tissue which has blood cavities, when penis is stimulated blood fills the cavities making the penis long and strong enough for copulation, this is known as erection ...
Miracle of Life Questions - Carondelet Catholic School
... contains ____________________ from both parents. A cloud of ______________surrounds the egg. These hairs, called ____________________ move the egg along towards the uterus. It takes the egg ____ days to travel of _______________ inches along the fallopian tube. The egg must join with a sperm within ...
... contains ____________________ from both parents. A cloud of ______________surrounds the egg. These hairs, called ____________________ move the egg along towards the uterus. It takes the egg ____ days to travel of _______________ inches along the fallopian tube. The egg must join with a sperm within ...
Exercise #1 - UBC Zoology
... Many strategies exist to match the timing of copulation to the timing of ovulation by the female. These range from situations in which the female changes in sexual characteristics around the time of ovulation to stimulate males to mate - to the situation in which males always want to mate but female ...
... Many strategies exist to match the timing of copulation to the timing of ovulation by the female. These range from situations in which the female changes in sexual characteristics around the time of ovulation to stimulate males to mate - to the situation in which males always want to mate but female ...
Male Reproductive System
... How Is the Male Reproductive System Important for Living? The male reproductive system is essential to the perpetuation of life: the female is dependent on the male for fertilization of her egg, even though it is she who carries the offspring through pregnancy and childbirth. Testosterone, the hormo ...
... How Is the Male Reproductive System Important for Living? The male reproductive system is essential to the perpetuation of life: the female is dependent on the male for fertilization of her egg, even though it is she who carries the offspring through pregnancy and childbirth. Testosterone, the hormo ...
Mating of gastropods
The mating of gastropods is a vast and varied topic, because the taxonomic class Gastropoda is very large and diverse, a group comprising sea snails and sea slugs, freshwater snails and land snails and slugs. Gastropods are second only to the class Insecta in terms of total number of species. Some gastropods have separate sexes, others are hermaphroditic. Some hermaphroditic groups have simultaneous hermaphroditism, whereas some sequential hermaphroditism. In addition, numerous very different mating strategies are used within different taxa.This article currently focuses primarily on the mating habits of air-breathing terrestrial slugs. Land slugs can be thought of as land snails that over evolutionary time have either lost the shell completely, have a very reduced external shell, or have retained only internal remnants of a shell. Land slugs are a highly polyphyletic group, which means that many land slug families are not at all closely related to one another.The majority of land slugs are simultaneous hermaphrodites, meaning they possess both male and female reproductive organs that are functional at the same time. Some species regularly self-fertilise. Uniparental reproduction may also occur by apomixis, an asexual process.For the most part, however, land slugs do mate: they find partners, and engage in elaborate courtship rituals before actual sperm transfer takes place. It is common for slugs to mate in a simultaneous reciprocal manner, as occurs in the monophyletic groups Limacoidea and Philomycidae. Limacoidea comprises the family Limacidae (the keelback slugs) and the largest genus of slugs, Deroceras, which contains over 100 known species. Sperm transfer may be external (as in Deroceras) or internal (as in Ariolimax).