Macmillan Science Library - Animal Sciences Vol..
... they adapt to their changing environments, and how they develop specialized structures over time. Entries in this category explain how animals develop from fertilized eggs to adults. While some forms of development are straightforward—like a puppy maturing to become a dog—other changes are more dram ...
... they adapt to their changing environments, and how they develop specialized structures over time. Entries in this category explain how animals develop from fertilized eggs to adults. While some forms of development are straightforward—like a puppy maturing to become a dog—other changes are more dram ...
flycatchers Ficedula Speciation in
... because closely related species often differ markedly in sexually selected traits, which gives rise to sexual isolation between them. However, theoretical models show that sexual selection is much less powerful when operating alone than when combined with either natural selection on the relevant tra ...
... because closely related species often differ markedly in sexually selected traits, which gives rise to sexual isolation between them. However, theoretical models show that sexual selection is much less powerful when operating alone than when combined with either natural selection on the relevant tra ...
Vocabulary
... Totipotent: able to divide to produce an entire new organism (most plant cells, some animal cells). ...
... Totipotent: able to divide to produce an entire new organism (most plant cells, some animal cells). ...
social selection, sexual selection and ecological competition
... with plumage signals that enable them to determine fighting ability and establish social dominance without direct physical contests [42–44]. Many other species use vocal [9] or visual [24] signals to defend foraging territories during the non-breeding season. In all cases, the traits mediating compe ...
... with plumage signals that enable them to determine fighting ability and establish social dominance without direct physical contests [42–44]. Many other species use vocal [9] or visual [24] signals to defend foraging territories during the non-breeding season. In all cases, the traits mediating compe ...
Sexual selection and the detection of ecological speciation
... category of isolation, females might have a general mate choice rule, such as ‘mate with own type’, which leads females to prefer males that are similar to their own size (McKinnon et al., 2004; Boughman et al., 2005). In the second category, females in one population might show a directional prefer ...
... category of isolation, females might have a general mate choice rule, such as ‘mate with own type’, which leads females to prefer males that are similar to their own size (McKinnon et al., 2004; Boughman et al., 2005). In the second category, females in one population might show a directional prefer ...
Biology 112 Exam Review
... Using the plant study table, compare: Land plants = nonvascular vs. vascular. Vascular = seedless vs. seed. Seed plants = gymnosperms vs. angiosperms. What is a plant? (P 551) What does alternation of generations mean? (P 552) Compare sporophytes to gametophytes. (P 552) What are four things p ...
... Using the plant study table, compare: Land plants = nonvascular vs. vascular. Vascular = seedless vs. seed. Seed plants = gymnosperms vs. angiosperms. What is a plant? (P 551) What does alternation of generations mean? (P 552) Compare sporophytes to gametophytes. (P 552) What are four things p ...
document
... • When certain species of sea slugs feed on jellyfishes, they incorporate the poisonous nematocysts of the jellyfish into their own tissues without causing these cells to ...
... • When certain species of sea slugs feed on jellyfishes, they incorporate the poisonous nematocysts of the jellyfish into their own tissues without causing these cells to ...
Diversity_Ch3_Transmittal_Final_CW
... allowing materials to move relatively quickly throughout. form from the fusion of two different nuclei within a single cell. This is Hyphae also form the reproductive structures of many fungi. still considered a form of sexual reproduction because each nucleus These structures take a wide variety of ...
... allowing materials to move relatively quickly throughout. form from the fusion of two different nuclei within a single cell. This is Hyphae also form the reproductive structures of many fungi. still considered a form of sexual reproduction because each nucleus These structures take a wide variety of ...
The Reptile Body
... that are laid outside the mother’s body. – Some snakes are lizards are ovoviviparous: fertilized eggs remain inside the female’s body for a long time and hatch inside the female • This protects the eggs from predators ...
... that are laid outside the mother’s body. – Some snakes are lizards are ovoviviparous: fertilized eggs remain inside the female’s body for a long time and hatch inside the female • This protects the eggs from predators ...
Chapter 47 9th ed ppt
... • Development occurs at many points in the life cycle of an animal • This includes metamorphosis and gamete production, as well as embryonic development ...
... • Development occurs at many points in the life cycle of an animal • This includes metamorphosis and gamete production, as well as embryonic development ...
Speciation in Ficedula flycatchers - Philosophical Transactions of
... because closely related species often differ markedly in sexually selected traits, which gives rise to sexual isolation between them. However, theoretical models show that sexual selection is much less powerful when operating alone than when combined with either natural selection on the relevant tra ...
... because closely related species often differ markedly in sexually selected traits, which gives rise to sexual isolation between them. However, theoretical models show that sexual selection is much less powerful when operating alone than when combined with either natural selection on the relevant tra ...
Does tusker`s attacks on female elephants are indicating towards
... 1968, at Hatpata, a number of elephant groups were feeding in an open area in the mid-after-noon hours. At 17:15 h, one male, who was also feeding in the same area, approached one of the groups. He made trunk to genitalia contact with one female and moved on toward another. Later on, when he moved t ...
... 1968, at Hatpata, a number of elephant groups were feeding in an open area in the mid-after-noon hours. At 17:15 h, one male, who was also feeding in the same area, approached one of the groups. He made trunk to genitalia contact with one female and moved on toward another. Later on, when he moved t ...
Biology+Term+List
... cell body In a neuron, the part that contains the nucleus and most of the cytoplasm and the organelles. PICTURE 1 PICTURE 2 cell cycle The sequence of events from one division of a cell to the next; consists of mitosis (or division) and interphase. PICTURE cells The smallest structural units of livi ...
... cell body In a neuron, the part that contains the nucleus and most of the cytoplasm and the organelles. PICTURE 1 PICTURE 2 cell cycle The sequence of events from one division of a cell to the next; consists of mitosis (or division) and interphase. PICTURE cells The smallest structural units of livi ...
Appendages
... Soft tissue increases in size until there is no space within the cuticle When body fills the cuticle, animal is in the premolt phase Epidermal cells enlarge before ecdysis ...
... Soft tissue increases in size until there is no space within the cuticle When body fills the cuticle, animal is in the premolt phase Epidermal cells enlarge before ecdysis ...
Sexual Mores, Ethical Theories, and the Overpopulation Myth
... will reach for pencil and paper, to calculate positive and negative Benthamite ‘units of happiness’; they will content themselves with ‘ballpark’ calculations. But many, going beyond ego-centered questions of personal advantage, will engage in serious ‘considerations of utility’ concerning the effec ...
... will reach for pencil and paper, to calculate positive and negative Benthamite ‘units of happiness’; they will content themselves with ‘ballpark’ calculations. But many, going beyond ego-centered questions of personal advantage, will engage in serious ‘considerations of utility’ concerning the effec ...
How to make a sex chromosome
... are karyotypically indistinguishable and just waiting to be discovered. ...
... are karyotypically indistinguishable and just waiting to be discovered. ...
Investigating the Social and Cognitive Factors Influencing Risky
... transmitted infections (STIs) such as Chlamydia and Gonorrhea are more prevalent amongst young adults than other age groups (CDC fact sheet, 2014) and approximately 54% of all unintended pregnancies occur among women in this age group (DePaul, 2009). The public health implications of these findings ...
... transmitted infections (STIs) such as Chlamydia and Gonorrhea are more prevalent amongst young adults than other age groups (CDC fact sheet, 2014) and approximately 54% of all unintended pregnancies occur among women in this age group (DePaul, 2009). The public health implications of these findings ...
Combining the Methods of Differential and Experimental Psychology
... have a culture). The relative role of nature and nurture (and their interaction) is a complex issue worth investigating, but the logical way to conduct such an investigation is not to use complex terms like “gender” which beg these questions, but to use the scientifically-precise term “sex” which is ...
... have a culture). The relative role of nature and nurture (and their interaction) is a complex issue worth investigating, but the logical way to conduct such an investigation is not to use complex terms like “gender” which beg these questions, but to use the scientifically-precise term “sex” which is ...
OrgasmiC DiffiCulties in WOmen Chapter 12
... in a harmonious lesbian relationship for the past 10 years. The quantity of sexual activity was considerably greater initially but diminished over the years, largely because of a discrepancy in sexual desire between the two (the patient’s partner was less interested). Sexual events were qualitativel ...
... in a harmonious lesbian relationship for the past 10 years. The quantity of sexual activity was considerably greater initially but diminished over the years, largely because of a discrepancy in sexual desire between the two (the patient’s partner was less interested). Sexual events were qualitativel ...
Relationships Journal of Social and Personal
... Complementary to research about actual friendship dyads, studies of heterosexuals’ attitudes find that sex affects feelings toward gay men and lesbians. Men report the most negative evaluations of gay men and women express feeling comfortable around both gay men and lesbians (Herek, 1988). However, ...
... Complementary to research about actual friendship dyads, studies of heterosexuals’ attitudes find that sex affects feelings toward gay men and lesbians. Men report the most negative evaluations of gay men and women express feeling comfortable around both gay men and lesbians (Herek, 1988). However, ...
Invitation to the Life Span by Kathleen Stassen
... – Cyberbullying- Bullying that occurs via Internet insults and rumors, texting, anonymous phone calls, and video embarrassment. – Some fear that the anonymity provided by electronic technology brings out the worst in people. – One expert on bullying believes that cyberbullying is similar to other fo ...
... – Cyberbullying- Bullying that occurs via Internet insults and rumors, texting, anonymous phone calls, and video embarrassment. – Some fear that the anonymity provided by electronic technology brings out the worst in people. – One expert on bullying believes that cyberbullying is similar to other fo ...
The Living World - Chapter 25 - McGraw Hill Higher Education
... Circulation Through the Heart Blood eventually returns to the heart The superior vena cava drains the upper body The inferior vena cava drains the lower body Blood passes from the right atrium into the right ventricle through the one-way tricuspid valve Ventricle contracts forcing blood through the ...
... Circulation Through the Heart Blood eventually returns to the heart The superior vena cava drains the upper body The inferior vena cava drains the lower body Blood passes from the right atrium into the right ventricle through the one-way tricuspid valve Ventricle contracts forcing blood through the ...
Expressing Your Sexuality Sexual Expression (continued)
... • Elements of Healthy Relationships • Predictability • Dependability ...
... • Elements of Healthy Relationships • Predictability • Dependability ...
CHAPTER ONE INTRODUCTION Overview Adolescence is a term
... sexual maturity in girls is marked by the onset of menstruation and in boys by the production of semen. The main hormones governing these changes are androgen in males and estrogen in female, substance also associated with the appearance of secondary sexual characteristic, facial, body and pubic hai ...
... sexual maturity in girls is marked by the onset of menstruation and in boys by the production of semen. The main hormones governing these changes are androgen in males and estrogen in female, substance also associated with the appearance of secondary sexual characteristic, facial, body and pubic hai ...
The Ape That Thought It Was a Peacock: Does Evolutionary
... In this section, we look at the theoretical underpinnings of the MCFC model—sexual selection theory and parental investment theory—and ask whether these theories apply to human beings. We argue that they do indeed apply, and that they provide a better account of certain psychological sex differences ...
... In this section, we look at the theoretical underpinnings of the MCFC model—sexual selection theory and parental investment theory—and ask whether these theories apply to human beings. We argue that they do indeed apply, and that they provide a better account of certain psychological sex differences ...
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.