Age and Fertility
... In an egg donation cycle, the donor receives fertility medications to stimulate the production of multiple eggs in her ovaries. At the same time, you are given hormone therapy to prepare your uterus to receive the fertilized eggs (embryos). After the eggs are obtained from the donor, they are ferti ...
... In an egg donation cycle, the donor receives fertility medications to stimulate the production of multiple eggs in her ovaries. At the same time, you are given hormone therapy to prepare your uterus to receive the fertilized eggs (embryos). After the eggs are obtained from the donor, they are ferti ...
Gerbils Biology anatomy and more
... They have been used in reproduction studies to evaluate antifertility drugs and in auditory research, because their hearing curve is closer to man's than ...
... They have been used in reproduction studies to evaluate antifertility drugs and in auditory research, because their hearing curve is closer to man's than ...
reproduction - Teaching Biology Project
... after birth (post-natal). Most offspring survive to reproductive age. E.g. Mammals, birds, some reptiles, exceptions amongst fish and Arthropods. ...
... after birth (post-natal). Most offspring survive to reproductive age. E.g. Mammals, birds, some reptiles, exceptions amongst fish and Arthropods. ...
REPRODUCTION - Teaching Biology Project
... after birth (post-natal). Most offspring survive to reproductive age. E.g. Mammals, birds, some reptiles, exceptions amongst fish and Arthropods. ...
... after birth (post-natal). Most offspring survive to reproductive age. E.g. Mammals, birds, some reptiles, exceptions amongst fish and Arthropods. ...
as a PDF - Instituto Nacional da Mata Atlântica
... to 13 for O. fragilis. Fecundity may vary with different food availability, egg size, and extreme environmental conditions in this widespread species of lizard. However, as already pointed out, more than one species are currently being treated under the name of O. striatus, and thus the differences ...
... to 13 for O. fragilis. Fecundity may vary with different food availability, egg size, and extreme environmental conditions in this widespread species of lizard. However, as already pointed out, more than one species are currently being treated under the name of O. striatus, and thus the differences ...
A View of Life
... Females benefit from selective choice by securing sperm with good genes. – Run-Away Hypothesis Females choose mates on the basis of traits that make them attractive to females. Mader: Biology 8th Ed. ...
... Females benefit from selective choice by securing sperm with good genes. – Run-Away Hypothesis Females choose mates on the basis of traits that make them attractive to females. Mader: Biology 8th Ed. ...
Two Scale Species on South Florida Slash Pine
... Female striped pine scales, Toumeyella pini, on the stem of slash pine. Females are larger and more globular or spherical in shape than their male ...
... Female striped pine scales, Toumeyella pini, on the stem of slash pine. Females are larger and more globular or spherical in shape than their male ...
Mammal Reproductive Strategies Driven by Offspring Mortality
... Such trade-offs should be evidenced as negative relationships in the residual variation that remains after accounting for the allometry of production within and between taxonomic and lifestyle groups. They can be empirically evaluated most powerfully and realistically by manipulating the relevant va ...
... Such trade-offs should be evidenced as negative relationships in the residual variation that remains after accounting for the allometry of production within and between taxonomic and lifestyle groups. They can be empirically evaluated most powerfully and realistically by manipulating the relevant va ...
extra-pair fertilisations in eight Charadrius plover species are not
... seasonal pattern (Dale et al. 1999, Küpper et al. 2004). One explanation is that the availability of high quality mates late in the breeding season is limited for females since most high quality males will already be paired up, meaning that females often end up pairing with a low quality mate. At th ...
... seasonal pattern (Dale et al. 1999, Küpper et al. 2004). One explanation is that the availability of high quality mates late in the breeding season is limited for females since most high quality males will already be paired up, meaning that females often end up pairing with a low quality mate. At th ...
Jeopardy - WordPress.com
... 1.The stamen is the tube that pollen goes down. The pollen then creates a seed with other pollen. 2. The pistol creates pollen. It drops it on the leaves so bees and other things can take it to another flower. ...
... 1.The stamen is the tube that pollen goes down. The pollen then creates a seed with other pollen. 2. The pistol creates pollen. It drops it on the leaves so bees and other things can take it to another flower. ...
Asexual Reproduction - Advanced
... Asexual reproduction can be very rapid. This is an advantage for many organisms. It allows these organisms to crowd out other organisms that reproduce more slowly. Bacteria, for example, may divide several times per hour. Under ideal conditions, 100 bacteria can divide to produce millions of bacteri ...
... Asexual reproduction can be very rapid. This is an advantage for many organisms. It allows these organisms to crowd out other organisms that reproduce more slowly. Bacteria, for example, may divide several times per hour. Under ideal conditions, 100 bacteria can divide to produce millions of bacteri ...
GUINEA PIGS FOR MEAT PRODUCTION
... distribution program for three years. They are hopeful that by 1991 they may have a few. These improved strains have been developed by local researchers and are in great demand throughout the cavy growing areas of South America. If you live in Ecuador or Peru and have not heard of them, perhaps you ...
... distribution program for three years. They are hopeful that by 1991 they may have a few. These improved strains have been developed by local researchers and are in great demand throughout the cavy growing areas of South America. If you live in Ecuador or Peru and have not heard of them, perhaps you ...
Lesson 2 | Asexual Reproduction
... 2. produces genetically identical offspring 3. a technique developed by scientists 4. occurs in nature 5. produces offspring from a cell or a cluster of cells 6. used by unicellular organisms Directions: Place your response on the lines provided. ...
... 2. produces genetically identical offspring 3. a technique developed by scientists 4. occurs in nature 5. produces offspring from a cell or a cluster of cells 6. used by unicellular organisms Directions: Place your response on the lines provided. ...
Flatworms are soft, flattened worms that have tissues and internal
... Flatworms have a digestive cavity with a single opening through which both food and wastes pass. Near the mouth is a muscular tube called a pharynx. Flatworms extend the pharynx out of the mouth. The pharynx then pumps food into the digestive cavity. Most parasitic worms do not need a complex digest ...
... Flatworms have a digestive cavity with a single opening through which both food and wastes pass. Near the mouth is a muscular tube called a pharynx. Flatworms extend the pharynx out of the mouth. The pharynx then pumps food into the digestive cavity. Most parasitic worms do not need a complex digest ...
Coerced group collaborative evolution as an explanation for sexual
... the genetic information of two individuals. These reproductive barriers have been well documented. For a detailed discussion on these reproductive barriers and isolating mechanisms such as ecological isolation, behavior isolation, temporal and mechanical isolation, as well as the prevention of fusio ...
... the genetic information of two individuals. These reproductive barriers have been well documented. For a detailed discussion on these reproductive barriers and isolating mechanisms such as ecological isolation, behavior isolation, temporal and mechanical isolation, as well as the prevention of fusio ...
Name: Date: Subject: Sexual vs. Asexual Reproduction Objectives
... Asexual reproduction produces offspring that are genetically identical to the parent organism. We call them clones. This doesn’t mean that they are exactly the same, it just means that they have the same DNA or genes. Asexual reproduction requires only 1 parent so asexually reproducing organisms do ...
... Asexual reproduction produces offspring that are genetically identical to the parent organism. We call them clones. This doesn’t mean that they are exactly the same, it just means that they have the same DNA or genes. Asexual reproduction requires only 1 parent so asexually reproducing organisms do ...
Caribbean Giant Roach
... relatives that ran up the boles of tree ferns 200 million years ago. But they are the closest thing to these ancient roaches man will ever be given to see-and very much the same size. Simply reading about these roaches or seeing them for a minute or two in an insect zoo cannot compare with actually ...
... relatives that ran up the boles of tree ferns 200 million years ago. But they are the closest thing to these ancient roaches man will ever be given to see-and very much the same size. Simply reading about these roaches or seeing them for a minute or two in an insect zoo cannot compare with actually ...
Seasonal Timing of Reproduction and Hibernation in the Edible
... mammalian hibernators in seasonal fluctuating environments often face extreme limits caused by the short duration of their active season. Within a few months they have to undergo gonadal development, because hypothermia and sexual competence are not compatible (e.g., Barnes et al., 1986); establish ...
... mammalian hibernators in seasonal fluctuating environments often face extreme limits caused by the short duration of their active season. Within a few months they have to undergo gonadal development, because hypothermia and sexual competence are not compatible (e.g., Barnes et al., 1986); establish ...
LIFE-HISTORY EVOLUTION IN REPTILES
... grow rapidly and can mature at a few months of age; females produce several large clutches of small eggs each year (Brown & Shine 2002). In contrast, female 1543-592X/05/1215-0023$20.00 ...
... grow rapidly and can mature at a few months of age; females produce several large clutches of small eggs each year (Brown & Shine 2002). In contrast, female 1543-592X/05/1215-0023$20.00 ...
- Central Marine Fisheries Research Institute
... where they are coated with a layer of egg jelly. The oviducal gland is connected to two large nidamental glands, which contains thick white gelatinous material which is used to embed each ovum into an individual protective capsule. The cuttlefish ovary grows rapidly during sexual maturation. The egg ...
... where they are coated with a layer of egg jelly. The oviducal gland is connected to two large nidamental glands, which contains thick white gelatinous material which is used to embed each ovum into an individual protective capsule. The cuttlefish ovary grows rapidly during sexual maturation. The egg ...
Animal Reproduction - Smyth County Schools
... http://www.dkimages.com/discover/Home/Animals/Inv ertebrates/Molluscs/Gastropods/MarineSnails/Crepidulidae/Atlantic-Slipper/Atlantic-Slipper1.html ...
... http://www.dkimages.com/discover/Home/Animals/Inv ertebrates/Molluscs/Gastropods/MarineSnails/Crepidulidae/Atlantic-Slipper/Atlantic-Slipper1.html ...
Full text in pdf format
... Study species. Coconut crabs were captured on Hatoma Island, southwest of Okinawa, Japan (24° 28’ N, 123° 49’ E). The size of functional maturity in females is estimated at 24.5 mm thoracic length (TL) (Sato & Yoseda 2008), and all males larger than 25 mm TL are physiologically mature (Sato et al. 2 ...
... Study species. Coconut crabs were captured on Hatoma Island, southwest of Okinawa, Japan (24° 28’ N, 123° 49’ E). The size of functional maturity in females is estimated at 24.5 mm thoracic length (TL) (Sato & Yoseda 2008), and all males larger than 25 mm TL are physiologically mature (Sato et al. 2 ...
insects and freshwater fish
... They are mainly foliage feeders, with some species eating a wide range of food, while others will only eat a specific kind. For example, clitarchus only live on kanuka and manuka. Stick insects cannot make sounds, and have no ears, but they have good eyesight. Males are much smaller than females, an ...
... They are mainly foliage feeders, with some species eating a wide range of food, while others will only eat a specific kind. For example, clitarchus only live on kanuka and manuka. Stick insects cannot make sounds, and have no ears, but they have good eyesight. Males are much smaller than females, an ...
Goniopsis cruentata (Mangrove Root Crab)
... stored until she releases her eggs. The eggs are kept in a spongy mass within the abdomen of the female. When their eggs are mature, the female discharges the eggs simultaneously with the stored sperm, which flows over and fertilizes the eggs where they hatch and undergo various stages of developmen ...
... stored until she releases her eggs. The eggs are kept in a spongy mass within the abdomen of the female. When their eggs are mature, the female discharges the eggs simultaneously with the stored sperm, which flows over and fertilizes the eggs where they hatch and undergo various stages of developmen ...
Reproductive suppression
Reproductive Suppression involves the prevention or inhibition of reproduction in otherwise healthy adult individuals. It includes delayed sexual maturation (puberty) or inhibition of sexual receptivity, facultatively increased interbirth interval through delayed or inhibited ovulation or spontaneous or induced abortion, abandonment of immature and dependent offspring, mate guarding, selective destruction and worker policing of eggs in some eusocial insects or cooperatively breeding birds, and infanticide (see also infanticide (zoology)), and infanticide in carnivores) of the offspring of subordinate females either by directly killing by dominant females or males in mammals or indirectly through the withholding of assistance with infant care in marmosets and some carnivores.The Reproductive Suppression Model argues that “females can optimize their lifetime reproductive success by suppressing reproduction when future [physical or social] conditions for the survival of offspring are likely to be greatly improved over present ones”. When intragroup competition (competition between individuals belonging to the same group) is high it may be beneficial to suppress the reproduction of others, and for subordinate females to suppress their own reproduction until a later time when social competition is reduced. This leads to reproductive skew within a social group, with some individuals having more offspring than others. The cost of reproductive suppression to the individual is lowest at the earliest stages of a reproductive event and reproductive suppression is often easiest to induce at the pre-ovulatory or earliest stages of pregnancy in mammals, and greatest after a birth. Therefore, neuroendocrine cues for assessing reproductive success should evolve to be reliable at early stages in the ovulatory cycle.Reproductive suppression occurs in its most extreme form in eusocial insects such as termites, hornets and bees and the mammalian naked mole rat which depend on a complex division of labor within the group for survival and in which specific genes, epigenetics and other factors are known to determine whether individuals will permanently be unable to breed or able to reach reproductive maturity under particular social conditions, and cooperatively breeding fish, birds and mammals in which a breeding pair depends on helpers whose reproduction is suppressed for the survival of their own offspring. In eusocial and cooperatively breeding animals most non-reproducing helpers engage in kin selection, enhancing their own inclusive fitness by ensuring the survival of offspring they are closely related to. Wolf packs suppress subordinate breeding.