Section 28–1 Introduction to the Arthropods
... c. Ganglia along a ventral nerve cord coordinate the movements of individual legs. d. Very few arthropods have a well-developed nervous system. 18. How do aquatic arthropods carry out excretion? ...
... c. Ganglia along a ventral nerve cord coordinate the movements of individual legs. d. Very few arthropods have a well-developed nervous system. 18. How do aquatic arthropods carry out excretion? ...
24 | fungi - Net Texts
... nucleus). (credit: modification of work by Dr. Godon Roberstad, CDC; scale-bar data from Matt Russell) ...
... nucleus). (credit: modification of work by Dr. Godon Roberstad, CDC; scale-bar data from Matt Russell) ...
variation in mate choice and mating preferences: a review of causes
... unchanged. At present, evidence for stability is based on data that the mean preference function at the population level is unchanged (e.g. Ryan et al., ). However, selection on female choosiness could lead to very different patterns of mate choice. For example, two species could both have audit ...
... unchanged. At present, evidence for stability is based on data that the mean preference function at the population level is unchanged (e.g. Ryan et al., ). However, selection on female choosiness could lead to very different patterns of mate choice. For example, two species could both have audit ...
Handout - Kristene Whitmore - International Urogynecological
... ◦ The persistent or recurrent lack of sexual fantasies, thoughts, desires and receptivity to sexual contact. ◦ The persistent or recurrent fear or aversion of sexual contact. ◦ The persistent or recurrent inability to become sexually aroused, often characterized by inadequate vaginal lubrication ...
... ◦ The persistent or recurrent lack of sexual fantasies, thoughts, desires and receptivity to sexual contact. ◦ The persistent or recurrent fear or aversion of sexual contact. ◦ The persistent or recurrent inability to become sexually aroused, often characterized by inadequate vaginal lubrication ...
Miquela Research Poster Final
... for observations that would be difficult to analyze in other species. Zebrafish contain many conserved genes that are similar to humans, making them an ideal model organism for studying diseases and disorders (Bakkers 2011). Among the observations that can be observed are cardiac development and mal ...
... for observations that would be difficult to analyze in other species. Zebrafish contain many conserved genes that are similar to humans, making them an ideal model organism for studying diseases and disorders (Bakkers 2011). Among the observations that can be observed are cardiac development and mal ...
- Journal of Clinical Investigation
... which is composed of a glycosylaminoglycan matrix and cumulus cells. They then bind to the zona pellucida that surrounds the mammalian egg (1, 2). The mouse and human zonae pellucidae are composed of three major glycoproteins, ZP1, ZP2, and ZP3. Solubilized zonae pellucidae from unfertilized mouse e ...
... which is composed of a glycosylaminoglycan matrix and cumulus cells. They then bind to the zona pellucida that surrounds the mammalian egg (1, 2). The mouse and human zonae pellucidae are composed of three major glycoproteins, ZP1, ZP2, and ZP3. Solubilized zonae pellucidae from unfertilized mouse e ...
4.7 S.Y.B.Sc. Zoology Syllabus
... Structure of Striated muscle fibre in human and Sliding filament theory Reproduction a. Asexual Reproduction- Fission, fragmentation, gemmule formation, budding b. Sexual reproduction i. Gametogenesis ii. Structure of male and female gametes in human iii. Types of fertilization iv. Oviparity, vivi ...
... Structure of Striated muscle fibre in human and Sliding filament theory Reproduction a. Asexual Reproduction- Fission, fragmentation, gemmule formation, budding b. Sexual reproduction i. Gametogenesis ii. Structure of male and female gametes in human iii. Types of fertilization iv. Oviparity, vivi ...
Domestic Violence, Sexual Assault, and Elite Athletes
... three men were dropped from the basketball team, they were not arrested or convicted. The woman who accused these three basketball players of sexual assault was shunned and verbally attacked because she was "ruining those athletes' lives" and attempting to hurt their chances of winning the national ...
... three men were dropped from the basketball team, they were not arrested or convicted. The woman who accused these three basketball players of sexual assault was shunned and verbally attacked because she was "ruining those athletes' lives" and attempting to hurt their chances of winning the national ...
Sperm competition and sperm cooperation: the potential role 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 different outcomes: (i) different tasks may be randomly ...
... 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 different outcomes: (i) different tasks may be randomly ...
Vaginal Orgasm Is Related to Better Mental Health and Is Relevant
... female orgasm is not necessary for reproduction. Hence, genetic liability to impairment in vaginal orgasm could exist in the gene pool but be associated with dysfunctions at other levels. Given that vaginal orgasm is robustly linked to indicators of better mental health, it is possible that to some ...
... female orgasm is not necessary for reproduction. Hence, genetic liability to impairment in vaginal orgasm could exist in the gene pool but be associated with dysfunctions at other levels. Given that vaginal orgasm is robustly linked to indicators of better mental health, it is possible that to some ...
Handicap principle implies emergence of dimorphic ornaments
... Darwin was the first to suggest that both natural and sexual selection play a role in the evolution of mating displays [1]. Natural selection is the shift in population traits based on an individual’s ability to survive and gather resources, while sexual selection is the shift in population traits b ...
... Darwin was the first to suggest that both natural and sexual selection play a role in the evolution of mating displays [1]. Natural selection is the shift in population traits based on an individual’s ability to survive and gather resources, while sexual selection is the shift in population traits b ...
Presentation
... A type of asexual reproduction in which the parent cell divides itself in half to produce an offspring ...
... A type of asexual reproduction in which the parent cell divides itself in half to produce an offspring ...
EOCT Review Jeopardy
... A type of asexual reproduction in which the parent cell divides itself in half to produce an offspring ...
... A type of asexual reproduction in which the parent cell divides itself in half to produce an offspring ...
Female Juvenile Delinquency and the Problem of Sexual Authority
... female misbehavior and the cultural role that it played. At the very moment when Popular Science Monthly was attempting to use ratios to begin an empirical investigation of of male to female delinquency "why girls are so good,"' 6 other national magazines were agonizing over climbing female arrest r ...
... female misbehavior and the cultural role that it played. At the very moment when Popular Science Monthly was attempting to use ratios to begin an empirical investigation of of male to female delinquency "why girls are so good,"' 6 other national magazines were agonizing over climbing female arrest r ...
Repeatability: Its role in evolutionary studies of mating behavior
... heritability could indicate that a trait has been under strong selection in the past and is still closely associated with fitness. The strong past selection would reduce additive genetic variance and increase the role of dominance variance (Mather and Jinks, 1971). The continued need to perform the ...
... heritability could indicate that a trait has been under strong selection in the past and is still closely associated with fitness. The strong past selection would reduce additive genetic variance and increase the role of dominance variance (Mather and Jinks, 1971). The continued need to perform the ...
exam 2 review pdf - Iowa State University
... b. The molecular tree no longer is divided by body cavities c. Clades are now distinguished by symmetry d. All of the above e. Only A & B 45. Which is not a characteristic of craniates? a. A cranium that encloses the brain in a protective housing b. A neural crest which is a group of embryonic cells ...
... b. The molecular tree no longer is divided by body cavities c. Clades are now distinguished by symmetry d. All of the above e. Only A & B 45. Which is not a characteristic of craniates? a. A cranium that encloses the brain in a protective housing b. A neural crest which is a group of embryonic cells ...
Teenage Pregnancy and Sexual Health Marketing
... attitudes and beliefs, which influence young people’s sexual behaviour. Social norms and peer pressure, perceived behavioural control (self efficacy) and risk images all play an important role in shaping both behavioural intention and, in young and/or inexperienced young people, behavioural willi ...
... attitudes and beliefs, which influence young people’s sexual behaviour. Social norms and peer pressure, perceived behavioural control (self efficacy) and risk images all play an important role in shaping both behavioural intention and, in young and/or inexperienced young people, behavioural willi ...
Obsessive Compulsive Disorder
... Imaginal exposure is helpful when triggers cannot be recreated for logistical reasons Imaginal exposure is also helpful for confronting obsessional thoughts that are not connected to specific behavioral rituals One way to do imaginal exposure is to record obsessional thoughts and fears in detail on ...
... Imaginal exposure is helpful when triggers cannot be recreated for logistical reasons Imaginal exposure is also helpful for confronting obsessional thoughts that are not connected to specific behavioral rituals One way to do imaginal exposure is to record obsessional thoughts and fears in detail on ...
Sexual selection in Fungi
... The theory of natural selection tells us that the individuals best adapted to their environment will survive best and get most offspring. The genes that code for these characteristics will increase in frequency and as a result extremely well adapted species evolve: perfectly streamlined fish, octopu ...
... The theory of natural selection tells us that the individuals best adapted to their environment will survive best and get most offspring. The genes that code for these characteristics will increase in frequency and as a result extremely well adapted species evolve: perfectly streamlined fish, octopu ...
The Evolution of Gender-Biased Nectar Production in
... phase. Floral nectar production rates, for example, can be higher during one of the sexual phases, and the result is gender-biased nectar production (GBNP). The unequal distribution of nectar between male and female phases immediately associates a different nectar production schedule with each gende ...
... phase. Floral nectar production rates, for example, can be higher during one of the sexual phases, and the result is gender-biased nectar production (GBNP). The unequal distribution of nectar between male and female phases immediately associates a different nectar production schedule with each gende ...
a deficiency in addressing campus sexual assault
... police agencies, of course, seek to improve the manner in which colleges and universities address sexual violence in their midst. Reporting sexual assault is an essential first step in obtaining services for victims and holding perpetrators accountable. Without reporting, victims remain voiceless. U ...
... police agencies, of course, seek to improve the manner in which colleges and universities address sexual violence in their midst. Reporting sexual assault is an essential first step in obtaining services for victims and holding perpetrators accountable. Without reporting, victims remain voiceless. U ...
Clinical Guidelines for Sexual Health Care of Men who Have
... for men and women. It may be a female sex worker clinic session during which transgender sex workers also attend, or an MSM clinic session for which there is only a male toilet. Some clinics and clients have no problem with this arrangement; in others, both the female and male clients complain about ...
... for men and women. It may be a female sex worker clinic session during which transgender sex workers also attend, or an MSM clinic session for which there is only a male toilet. Some clinics and clients have no problem with this arrangement; in others, both the female and male clients complain about ...
Sarah McHugh - Physalia physalia and Cassiopea sp.
... of their bell, but have 4 to 8 highly branched oral arms. It is also common for the organisms in this order to have multiple mouths, one primary and many secondary, often distributed all along the oral arms. ...
... of their bell, but have 4 to 8 highly branched oral arms. It is also common for the organisms in this order to have multiple mouths, one primary and many secondary, often distributed all along the oral arms. ...
Eye Tracking of Men`s Preferences for Female Breast Size and
... study (Dixson, Grimshaw, Linklater, & Dixson, 2009) presented men with individual front-posed nude images of women that had been manipulated to show small, medium or large breasts and either low (0.7) or high (0.9) waist-to-hip ratios (WHR). Although ratings of attractiveness were related primarily ...
... study (Dixson, Grimshaw, Linklater, & Dixson, 2009) presented men with individual front-posed nude images of women that had been manipulated to show small, medium or large breasts and either low (0.7) or high (0.9) waist-to-hip ratios (WHR). Although ratings of attractiveness were related primarily ...
Sexual reproduction
Sexual reproduction is a form of reproduction where two morphologically distinct types of specialized reproductive cells called gametes fuse together, involving a female's large ovum (or egg) and a male's smaller sperm. Each gamete contains half the number of chromosomes of normal cells. They are created by a specialized type of cell division, which only occurs in eukaryotic cells, known as meiosis. The two gametes fuse during fertilization to produce DNA replication and the creation of a single-celled zygote which includes genetic material from both gametes. In a process called genetic recombination, genetic material (DNA) joins up so that homologous chromosome sequences are aligned with each other, and this is followed by exchange of genetic information. Two rounds of cell division then produce four daughter cells with half the number of chromosomes from each original parent cell, and the same number of chromosomes as both parents, though self-fertilization can occur. For instance, in human reproduction each human cell contains 46 chromosomes, 23 pairs, except gamete cells, which only contain 23 chromosomes, so the child will have 23 chromosomes from each parent genetically recombined into 23 pairs. Cell division initiates the development of a new individual organism in multicellular organisms, including animals and plants, for the vast majority of whom this is the primary method of reproduction. A species is defined as a taxonomic rank. A species is often defined as the largest group of organisms where two hybrids are capable of reproducing fertile offspring, typically using sexual reproduction, although the species problem encompasses a series of difficult related questions that often come up when biologists define the word species. The evolution of sexual reproduction is a major puzzle because asexual reproduction should be able to outcompete it as every young organism created can bear its own young. This implies that an asexual population has an intrinsic capacity to grow more rapidly with each generation. This 50% cost is a fitness disadvantage of sexual reproduction. The two-fold cost of sex includes this cost and the fact that any organism can only pass on 50% of its own genes to its offspring. One definite advantage of sexual reproduction is that it prevents the accumulation of genetic mutations.Sexual selection is a mode of natural selection in which some individuals out-reproduce others of a population because they are better at securing mates for sexual reproduction. It has been described as ""a powerful evolutionary force that does not exist in asexual populations""Prokaryotes reproduce through asexual reproduction but may display processes similar to sexual reproduction (mechanisms for lateral gene transfer such as bacterial conjugation, transformation and transduction), but they do not lead to reproduction. In prokaryotes, the initial cell has additional or transformed genetic material.