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BIO 102: GENERAL BIOLOGY II UNIT: 4
... They have the polyp and medusa forms in their life cycle The polyp is the predominant stage while the medusa is the simple stage They reproduce by alternation of asexual and sexual phases of life cycles e.g Hydra, Obelia, Physalia (Portuguese man-of-war) ...
... They have the polyp and medusa forms in their life cycle The polyp is the predominant stage while the medusa is the simple stage They reproduce by alternation of asexual and sexual phases of life cycles e.g Hydra, Obelia, Physalia (Portuguese man-of-war) ...
The Evolutionary Enigma of Sex
... sexual reproduction to be rare. Yet, the vast majority of eukaryotic organisms reproduce sexually—at least occasionally. Among named animal species, only ∼0.1% are considered to be exclusively asexual (Vrijenhoek 1998). While the ability to reproduce asexually is more widespread in plants, less than ...
... sexual reproduction to be rare. Yet, the vast majority of eukaryotic organisms reproduce sexually—at least occasionally. Among named animal species, only ∼0.1% are considered to be exclusively asexual (Vrijenhoek 1998). While the ability to reproduce asexually is more widespread in plants, less than ...
Reprint
... direction are necessary to make further progress in studying sexual conflict. In particular, some specification of sexual conflict is required for tests. Any definition of sexual conflict must first make reference to the object over which conflict is occurring. To this end, it is useful to define sh ...
... direction are necessary to make further progress in studying sexual conflict. In particular, some specification of sexual conflict is required for tests. Any definition of sexual conflict must first make reference to the object over which conflict is occurring. To this end, it is useful to define sh ...
The New York State Forum
... Dear Members, as mentioned, we are very regretful of our lack of correspondence related to NYS ATSA/Alliance updates. We have been working hard on behalf of both organizations, but have not communicated as such. Please see below a snapshot of what some of the board members have been doing. Larry Men ...
... Dear Members, as mentioned, we are very regretful of our lack of correspondence related to NYS ATSA/Alliance updates. We have been working hard on behalf of both organizations, but have not communicated as such. Please see below a snapshot of what some of the board members have been doing. Larry Men ...
The evolution of reversed sexual size dimorphism in hawks, falcons
... (van Noordwijk, 2002). Because variables need to be dichotomous for this method, I used the mean of continuous data as a threshold. As the method can only use two variables at a time, controlling for confounding variables is not possible. Pagel’s method uses likelihood ratio (LR) tests to determine ...
... (van Noordwijk, 2002). Because variables need to be dichotomous for this method, I used the mean of continuous data as a threshold. As the method can only use two variables at a time, controlling for confounding variables is not possible. Pagel’s method uses likelihood ratio (LR) tests to determine ...
Indicators of Male Fertility, Family Formation, and
... Indicators of Male Fertility, Family Formation, and Sexual Behavior In the past, most of the focus of fertility-related research as well as research into the wellbeing of children, has focused on the mother-child dyad. Little attention has been paid to the role of males in conceiving and raising ch ...
... Indicators of Male Fertility, Family Formation, and Sexual Behavior In the past, most of the focus of fertility-related research as well as research into the wellbeing of children, has focused on the mother-child dyad. Little attention has been paid to the role of males in conceiving and raising ch ...
Sexual Differences in Flight Calls and the Cue for Vocal Sex
... ka et al. 1989b). Since visual signals are less effective in communication between the nocturnal birds, the ability to discriminate Flight Calls of both sexesplays a major role in sexidentification of the Swinhoe’s Storm-Petrel. It is considered that there are clear-cut sexual differences in the cal ...
... ka et al. 1989b). Since visual signals are less effective in communication between the nocturnal birds, the ability to discriminate Flight Calls of both sexesplays a major role in sexidentification of the Swinhoe’s Storm-Petrel. It is considered that there are clear-cut sexual differences in the cal ...
Sexual Selection and the Psychology of Intergroup Conflict
... strained by their reproductive physiology for a relatively lower reproductive ceiling over their life span; as a result, increasing the number of sexual partners does not increase reproductive success to the same degree as it does for men. In fact, it can place women at higher risk for harmful conse ...
... strained by their reproductive physiology for a relatively lower reproductive ceiling over their life span; as a result, increasing the number of sexual partners does not increase reproductive success to the same degree as it does for men. In fact, it can place women at higher risk for harmful conse ...
An evolutionary behaviorist - Portsmouth Research Portal
... sexual behavior not only because they are statistically associated with greater fertility and therefore greater reproductive success but also because those sexual partners are necessarily more scarce than partners more average on genetically endowed qualities. Evolution has used orgasm to reinforce ...
... sexual behavior not only because they are statistically associated with greater fertility and therefore greater reproductive success but also because those sexual partners are necessarily more scarce than partners more average on genetically endowed qualities. Evolution has used orgasm to reinforce ...
Salamanders, Anurans and Cealians
... even to the underside of leaves Adhesion and detachment alternate as the frog walks across a leaf Because of the mechanism by which the toes can cling to the surface, a tree frog must orient with its head facing up for its toes to remain pointed upwards & clinging to surface Descending a vertical su ...
... even to the underside of leaves Adhesion and detachment alternate as the frog walks across a leaf Because of the mechanism by which the toes can cling to the surface, a tree frog must orient with its head facing up for its toes to remain pointed upwards & clinging to surface Descending a vertical su ...
Sexual Side Effects of Antidepressant Medications
... only a small minority of antidepressant-treated patients (3% of 5356 patients surveyed) consider sexual functioning not at all important, and that the vast majority of patients are willing to talk about sexual functioning (Clayton et al. 2002). As evidenced by the large discrepancy, up to 60% (Balon ...
... only a small minority of antidepressant-treated patients (3% of 5356 patients surveyed) consider sexual functioning not at all important, and that the vast majority of patients are willing to talk about sexual functioning (Clayton et al. 2002). As evidenced by the large discrepancy, up to 60% (Balon ...
Age and Fertility
... unprotected intercourse. If you are 35 or older however, you should initiate your evaluation as soon as possible. If you are concerned about fertility or have an obvious medical problem affecting your ability to conceive, such as amenorrhea, sexual dysfunction, a history of pelvic disease, or prior ...
... unprotected intercourse. If you are 35 or older however, you should initiate your evaluation as soon as possible. If you are concerned about fertility or have an obvious medical problem affecting your ability to conceive, such as amenorrhea, sexual dysfunction, a history of pelvic disease, or prior ...
Conflict on the Sex Chromosomes: Cause, Effect, and Complexity
... highly conserved across long periods of evolutionary time, whereas others change quickly and even vary across populations of the same species. However, there are some predictions suggesting that sex chromosome turnover itself ...
... highly conserved across long periods of evolutionary time, whereas others change quickly and even vary across populations of the same species. However, there are some predictions suggesting that sex chromosome turnover itself ...
ENDOCRINE SYSTEM The endocrine glands release hormones
... Crayfish have SEPARATE SEXES. They are either MALES with a TESTES for making sperm or FEMALES with an ovary for making eggs. The GONADS (reproductive organs) are located underneath the heart. In females you will see the ovaries with eggs inside and in males you will see the tiny tubules for carrying ...
... Crayfish have SEPARATE SEXES. They are either MALES with a TESTES for making sperm or FEMALES with an ovary for making eggs. The GONADS (reproductive organs) are located underneath the heart. In females you will see the ovaries with eggs inside and in males you will see the tiny tubules for carrying ...
Crayfish Lab - c214science
... Crayfish have SEPARATE SEXES. They are either MALES with a TESTES for making sperm or FEMALES with an ovary for making eggs. The GONADS (reproductive organs) are located underneath the heart. In females you will see the ovaries with eggs inside and in males you will see the tiny tubules for carrying ...
... Crayfish have SEPARATE SEXES. They are either MALES with a TESTES for making sperm or FEMALES with an ovary for making eggs. The GONADS (reproductive organs) are located underneath the heart. In females you will see the ovaries with eggs inside and in males you will see the tiny tubules for carrying ...
HO#3 - Teachers TryScience
... Crayfish have SEPARATE SEXES. They are either MALES with a TESTES for making sperm or FEMALES with an ovary for making eggs. The GONADS (reproductive organs) are located underneath the heart. In females you will see the ovaries with eggs inside and in males you will see the tiny tubules for carrying ...
... Crayfish have SEPARATE SEXES. They are either MALES with a TESTES for making sperm or FEMALES with an ovary for making eggs. The GONADS (reproductive organs) are located underneath the heart. In females you will see the ovaries with eggs inside and in males you will see the tiny tubules for carrying ...
Grade 7 Choosing Abstinence Lesson 1
... 3. Explain that groups must plan and present promotional material as outlined on the handout. 4. Allow groups time to plan and create their promotional material as outlined on the handout. 5. Have groups present their promotional material to the class. 6. Display any/all assignments that promote abs ...
... 3. Explain that groups must plan and present promotional material as outlined on the handout. 4. Allow groups time to plan and create their promotional material as outlined on the handout. 5. Have groups present their promotional material to the class. 6. Display any/all assignments that promote abs ...
Your Inner Fish - 06_Chapter Six
... develop and watched what happened. The embryo formed twins: two complete salamanders emerged, each with a normal body plan and each entirely viable. The conclusion was obvious: from one egg can come more than one individual. This is what identical twins are. Biologically, Spemann had demonstrated th ...
... develop and watched what happened. The embryo formed twins: two complete salamanders emerged, each with a normal body plan and each entirely viable. The conclusion was obvious: from one egg can come more than one individual. This is what identical twins are. Biologically, Spemann had demonstrated th ...
Do exaggerated sexual swellings function in female mating
... of the hypothesis that focuses on aspects of female mating competition, based on the following predictions: (1) Increases in the adult sex ratio (females per male) are expected over evolutionary origins of exaggerated swellings, under the assumption that a higher ratio of females to males indicates ...
... of the hypothesis that focuses on aspects of female mating competition, based on the following predictions: (1) Increases in the adult sex ratio (females per male) are expected over evolutionary origins of exaggerated swellings, under the assumption that a higher ratio of females to males indicates ...
Between DSM and ICD: Paraphilias and the Transformation of
... The simultaneous revision of the two major international classifications of disease serves as an opportunity to observe the dynamic processes through which social norms of sexuality are constructed, and are subject to change, through the process of pathologization or depathologization of specific‘‘s ...
... The simultaneous revision of the two major international classifications of disease serves as an opportunity to observe the dynamic processes through which social norms of sexuality are constructed, and are subject to change, through the process of pathologization or depathologization of specific‘‘s ...
Psychosocial and Biological Treatment Considerations for the
... development of strategies to implement when the cycle is triggered and/or in the context of situations identified as high risk.48 Although the efficacy of treatment practices for sex offenders has been questioned and viewed at best as equivocal in the past, more recent research using improved method ...
... development of strategies to implement when the cycle is triggered and/or in the context of situations identified as high risk.48 Although the efficacy of treatment practices for sex offenders has been questioned and viewed at best as equivocal in the past, more recent research using improved method ...
doc - Peace Corps Tanzania
... Vaccine - A suspension of dead, inactivated or harmless germs which when introduced to the blood stream stimulates the production of antibodies and makes the body immune to attack from that disease 1.3.4 HIV/AIDS and STDs HIV - The virus which causes AIDS. It is transmitted by unsafe sex with an inf ...
... Vaccine - A suspension of dead, inactivated or harmless germs which when introduced to the blood stream stimulates the production of antibodies and makes the body immune to attack from that disease 1.3.4 HIV/AIDS and STDs HIV - The virus which causes AIDS. It is transmitted by unsafe sex with an inf ...
Apago PDF Enhancer
... The history of the land plants is replete with evolutionary innovations allowing the ancestors of aquatic algae to colonize the harsh and varied terrestrial terrains. Early innovations made survival on land possible, later followed by an explosion of plant life that continues to change the land and ...
... The history of the land plants is replete with evolutionary innovations allowing the ancestors of aquatic algae to colonize the harsh and varied terrestrial terrains. Early innovations made survival on land possible, later followed by an explosion of plant life that continues to change the land and ...
The species recognition hypothesis does not explain the presence
... Padian & Horner, 2011a; Allain et al., 2012; Schott & Evans, 2012; Taylor & Wedel, 2012). This is despite the fact that similar structures in extant vertebrates have roles in sexual selection (Knell et al., 2013) and the lack of evidence for species recognition. The term ‘species recognition’ has be ...
... Padian & Horner, 2011a; Allain et al., 2012; Schott & Evans, 2012; Taylor & Wedel, 2012). This is despite the fact that similar structures in extant vertebrates have roles in sexual selection (Knell et al., 2013) and the lack of evidence for species recognition. The term ‘species recognition’ has be ...
The species recognition hypothesis does not explain
... Padian & Horner, 2011a; Allain et al., 2012; Schott & Evans, 2012; Taylor & Wedel, 2012). This is despite the fact that similar structures in extant vertebrates have roles in sexual selection (Knell et al., 2013) and the lack of evidence for species recognition. The term ‘species recognition’ has be ...
... Padian & Horner, 2011a; Allain et al., 2012; Schott & Evans, 2012; Taylor & Wedel, 2012). This is despite the fact that similar structures in extant vertebrates have roles in sexual selection (Knell et al., 2013) and the lack of evidence for species recognition. The term ‘species recognition’ has be ...
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.