The origin of gender and sexual reproduction
... However, by the mid 1960s this explanation had been ‘subjected to a more critical scrutiny’, and eventually the idea of group selection overriding individual selection was shown to be false and thus was discarded. Additionally, it was believed that, despite the 50% disadvantage for individuals, th ...
... However, by the mid 1960s this explanation had been ‘subjected to a more critical scrutiny’, and eventually the idea of group selection overriding individual selection was shown to be false and thus was discarded. Additionally, it was believed that, despite the 50% disadvantage for individuals, th ...
Insects of the Wet Tropics - Wet Tropics of Queensland
... Camouflage provides insects with protection from predators. Stick insects excel as camouflage artists in mimicking sticks, bark, leaves and grasses. This heavy bodied female is wingless and spends much of her time immobile, inverted amongst the foliage. However, the slender males are equipped with l ...
... Camouflage provides insects with protection from predators. Stick insects excel as camouflage artists in mimicking sticks, bark, leaves and grasses. This heavy bodied female is wingless and spends much of her time immobile, inverted amongst the foliage. However, the slender males are equipped with l ...
The Reproductive System
... The primary sex organs are the TESTES (male) and OVARIES (female). They produce sex cells called gametes. They are also MIXED GLANDS. In females, all meiosis is complete before birth-therefore, all the eggs that will be present are there at birth. They are dormant. In males, meiosis begins at pubert ...
... The primary sex organs are the TESTES (male) and OVARIES (female). They produce sex cells called gametes. They are also MIXED GLANDS. In females, all meiosis is complete before birth-therefore, all the eggs that will be present are there at birth. They are dormant. In males, meiosis begins at pubert ...
Hoofed Species Show
... Breeding: Males are polygamous and gather harems of females during the breeding season. They use a “bugling” call and scent to attract females and defend their territory/harem. Distinguishing Features: ...
... Breeding: Males are polygamous and gather harems of females during the breeding season. They use a “bugling” call and scent to attract females and defend their territory/harem. Distinguishing Features: ...
here - Athens-Clarke County, GA
... found throughout the U.S. as well as parts of Canada and Mexico. They may be encountered in forested areas or arid habitats like deserts. Diet: Large insects and other arthropods Lifespan: Females can live up to 2 years Reproduction: The male spider seeks out a female during the summer months, tappi ...
... found throughout the U.S. as well as parts of Canada and Mexico. They may be encountered in forested areas or arid habitats like deserts. Diet: Large insects and other arthropods Lifespan: Females can live up to 2 years Reproduction: The male spider seeks out a female during the summer months, tappi ...
The Chinese Crocodile Lizard
... In order to provide sound sanitary conditions and controlled feeding it is best to rear the young in plastic shoeboxes, replacing the lids with 1Ú8-inch screening for UV exposure. Vitalight bulbs placed 12 inches above the containers will suffice. Water at a depth of 1 inch with a flat stone as rest ...
... In order to provide sound sanitary conditions and controlled feeding it is best to rear the young in plastic shoeboxes, replacing the lids with 1Ú8-inch screening for UV exposure. Vitalight bulbs placed 12 inches above the containers will suffice. Water at a depth of 1 inch with a flat stone as rest ...
Reproductive Organs
... TERMS AND DEFINITIONS These are only a few terms and definitions that will be used in this lesson. Other terms and definitions will be dispersed throughout the lesson. a. BROAD L IGAMENTS: Two wing-like structures that extend from the lateral margins of the uterus to the pelvic walls and divide the ...
... TERMS AND DEFINITIONS These are only a few terms and definitions that will be used in this lesson. Other terms and definitions will be dispersed throughout the lesson. a. BROAD L IGAMENTS: Two wing-like structures that extend from the lateral margins of the uterus to the pelvic walls and divide the ...
Zoology Exercise #10: Phylum Nematoda Lab Guide All animals
... 2. Discuss at least 3 unique attributes pertaining to the Genus Ascaris. 3. Discuss how common these parasites are in the United States, who they tend to infect, and how they manifest themselves in those infected. ...
... 2. Discuss at least 3 unique attributes pertaining to the Genus Ascaris. 3. Discuss how common these parasites are in the United States, who they tend to infect, and how they manifest themselves in those infected. ...
American toad - The Fluvarium
... black spots on their back with only one or two warts in it. The underside is usually spotted, and mainly on the forward half. Like all toads, they have poison sacs called parotid glands, which look like enlarged bumps located on the back, just behind the eye. These toads have two cranial crests or t ...
... black spots on their back with only one or two warts in it. The underside is usually spotted, and mainly on the forward half. Like all toads, they have poison sacs called parotid glands, which look like enlarged bumps located on the back, just behind the eye. These toads have two cranial crests or t ...
coelomate worms
... Dioecious, no sexual dimorphism Gametes do not grow or ripen in gonads = small at all times Trochophore larva ...
... Dioecious, no sexual dimorphism Gametes do not grow or ripen in gonads = small at all times Trochophore larva ...
Butterflies~RF6c1e29.TMP
... will look for butterflies with wings that are the correct colour and pattern. When a male sights a potential mate it will fly closer, often behind or above the female. Once closer, the male will release special chemicals, called pheromones, while it flutters its wings a bit more than usual. The male ...
... will look for butterflies with wings that are the correct colour and pattern. When a male sights a potential mate it will fly closer, often behind or above the female. Once closer, the male will release special chemicals, called pheromones, while it flutters its wings a bit more than usual. The male ...
Patterns of sexual dimorphism in Mexican alligator lizards, Barisia
... sexual dimorphism observed in head length. Several studies have found a correlation between male-male combat and sexually dimorphic head size in lizards, potentially due to the advantage greater bite force confers during competition (e.g., Carothers 1984; Herrel et al. 2010; Vanhooydonck et al. 2010 ...
... sexual dimorphism observed in head length. Several studies have found a correlation between male-male combat and sexually dimorphic head size in lizards, potentially due to the advantage greater bite force confers during competition (e.g., Carothers 1984; Herrel et al. 2010; Vanhooydonck et al. 2010 ...
Intrapopulation variation in life history traits of Boa constrictor
... operational sex ratio, based on mature individuals(potential breeders), is also close to 1 : 1, which could re ect that there is no reproductive competition in this species (Kvarnemo and Ahnesjö, 1996). Despite this, we found mating groups with one female and several males that could be competing i ...
... operational sex ratio, based on mature individuals(potential breeders), is also close to 1 : 1, which could re ect that there is no reproductive competition in this species (Kvarnemo and Ahnesjö, 1996). Despite this, we found mating groups with one female and several males that could be competing i ...
Illnesses of the Female Reproductive System
... However if the egg is not fertilized it will deteriorate and die within 48 hours ...
... However if the egg is not fertilized it will deteriorate and die within 48 hours ...
Outline of: Bryja, J., Patzenhauerova, H., Albrecht, T., Mosansky, L
... testicles, but they also exhibit different behaviors than the others. They are less aggressive towards one another, and don’t exchange allogrooming for sex nearly as often as the most promiscuous sub-species (A. agrarius). We are interested in the cause and effect relationship of their aggressivenes ...
... testicles, but they also exhibit different behaviors than the others. They are less aggressive towards one another, and don’t exchange allogrooming for sex nearly as often as the most promiscuous sub-species (A. agrarius). We are interested in the cause and effect relationship of their aggressivenes ...
phylum nematoda
... down from the ovary, they are fertilized. Unlike any other nematode the eggs develop as they pass down the length of the uterus and by the time they reach its most anterior end they have already hatched into the small juveniles. They are released from the vulva on the ventral surface about half way ...
... down from the ovary, they are fertilized. Unlike any other nematode the eggs develop as they pass down the length of the uterus and by the time they reach its most anterior end they have already hatched into the small juveniles. They are released from the vulva on the ventral surface about half way ...
Female Condoms - Saginaw County Department of Public Health
... condom. The closed end, which has a flexible ring, is inserted into the vagina, while the open end remains on the outside. Female condoms prevent sexually transmitted infections (STIs) and pregnancy when they are used correctly and consistently. EFFECTIVENESS: • At least 80% effective in preventing ...
... condom. The closed end, which has a flexible ring, is inserted into the vagina, while the open end remains on the outside. Female condoms prevent sexually transmitted infections (STIs) and pregnancy when they are used correctly and consistently. EFFECTIVENESS: • At least 80% effective in preventing ...
Nannostomus unifasciatus (One-lined Pencil Fish)
... periphyton (micro-algae films growing on rocks), insects, worms and small crustaceans. After hatching, the larva first feeds by absorbing its yolk sac, followed by periphyton. They are also prey to higher trophic levels and play an important role in the overall health of an aquatic system. POPULATIO ...
... periphyton (micro-algae films growing on rocks), insects, worms and small crustaceans. After hatching, the larva first feeds by absorbing its yolk sac, followed by periphyton. They are also prey to higher trophic levels and play an important role in the overall health of an aquatic system. POPULATIO ...
Strong Stick Insect, Anchiale briareus
... Strong Stick Insects are large straight bodied insects, with an array of small knobs or spines on their thorax. Like most phasmids, the females are much larger and more robust than the males, and can grow to a length of 170mm. Mature females have short fan-like wings which are used to startle predat ...
... Strong Stick Insects are large straight bodied insects, with an array of small knobs or spines on their thorax. Like most phasmids, the females are much larger and more robust than the males, and can grow to a length of 170mm. Mature females have short fan-like wings which are used to startle predat ...
Madagascar Hissing Cockroach
... each other but not towards females or nymphs (young). • They produce a snake-like hissing that startles predators. When disturbed, the entire colony hisses together for a really disturbing sound. There are at least 5 types of hisses: a male combat hiss, 2 types of courting and 1 mating hiss, and an ...
... each other but not towards females or nymphs (young). • They produce a snake-like hissing that startles predators. When disturbed, the entire colony hisses together for a really disturbing sound. There are at least 5 types of hisses: a male combat hiss, 2 types of courting and 1 mating hiss, and an ...
vascular anatomy for rotational acetabular osteotomy
... the depth of the bone hole was 25 mm. In females the minimum xx' value was 26 mm and the maximum bone hole depth value was 18 mm. If the drill bit is made to stop at a depth of approximately 25 mm for males and 20 mm for females, it is thought to be sufficient to create a hole in the bone. The resul ...
... the depth of the bone hole was 25 mm. In females the minimum xx' value was 26 mm and the maximum bone hole depth value was 18 mm. If the drill bit is made to stop at a depth of approximately 25 mm for males and 20 mm for females, it is thought to be sufficient to create a hole in the bone. The resul ...
Turkey - Rolling Hills Zoo
... Turkey chicks, like all pheasant-like birds are precocial birds. That means that they hatch feathered and ready to follow their parents. Birds, such as parrots, which are born featherless and helpless are referred to ...
... Turkey chicks, like all pheasant-like birds are precocial birds. That means that they hatch feathered and ready to follow their parents. Birds, such as parrots, which are born featherless and helpless are referred to ...
Nephila clavipes (Golden Orb Weaver)
... changing of seasons (higher in warmer temperatures and lower when the temperature drops). They stay in their webs repairing and rebuilding when necessary. This species is abundant in the areas in which they occur and also be found in other areas once the temperature is adequate for its survival. REP ...
... changing of seasons (higher in warmer temperatures and lower when the temperature drops). They stay in their webs repairing and rebuilding when necessary. This species is abundant in the areas in which they occur and also be found in other areas once the temperature is adequate for its survival. REP ...
Effect of extra prenatal testosterone on rabbit offspring at birth
... sesame group was also conducted. The following measures were taken in the offspring at birth: anogenital-distance (AGD), body weight (BW), litter size, and sex ratio. To avoid possible seasonal (sequential) effect, all of these measures were compared to the given does’ previous litters. As a result, ...
... sesame group was also conducted. The following measures were taken in the offspring at birth: anogenital-distance (AGD), body weight (BW), litter size, and sex ratio. To avoid possible seasonal (sequential) effect, all of these measures were compared to the given does’ previous litters. As a result, ...
Sexual mimicry
Sexual mimicry occurs when one sex mimics the opposite sex in its behavior, appearance, or chemical signalling. It is more commonly seen within invertebrate species, although sexual mimicry is also seen among vertebrates such as spotted hyenas. Sexual mimicry is commonly used as a mating strategy to gain access to a mate, a defense mechanism to avoid more dominant individuals, or a survival strategy. It can also be a physical characteristic that establishes an individual’s place in society. Sexual mimicry is employed differently across species and it is part of their strategy for survival and reproduction. Examples of sexual mimicry in animals include the spotted hyena, certain types of fish, passerine birds and some species of insect among others. These are cases of intraspecific sexual mimicry, but interspecific sexual mimicry can also occur in some plant species, especially orchids. In plants employing sexual mimicry, flowers mimic mating signals of their pollinator insects. These insects are attracted and pollinate the flowers through pseudocopulations or other sexual behaviors performed on the flower.