Once a suitable host egg is found, she measures the egg with her antennae to determine how many eggs of her own she can lie inside. Next, she punctures the host egg with her ovipositor. This is an important step for a few reasons. The female can determine whether the egg is suitable by feeling around to inspect the health and freshness of the egg. If it suits her well, she then deposits her own egg into the host.
The Sperm and the Egg PSY 265 Psychology of Human Sexuality The Sperm and the Egg We all have that “the talk” with our parents about the birds and the bees, or how babies are made. Have you ever really wondered what exactly goes on when two people indulge in intercourse? Or how exactly a sperm and an egg meet and what happens from there? In this paper things will be explained to you in a whole different level that you will have all the answers to your questions and more. First things first, we all know that men have a penis and woman have a vagina.
Sexual selection in Frogs (Anurans) Sexual selection is the process in which organisms compete to mate. Sexual selection has important implications for natural selection because the basis of natural selection is fitness or the ability of an organism to reproduce. The ability to mate is what guarantees an organism the passing of his genetic information to his offspring and insures that his genetic information is carried through future generations. Sexual selection therefore leads to secondary sexual characteristics that are a result of selection pressure when males compete. Different organisms have unique mechanisms when it comes to sexual selection, some species have combat (giraffe necking), some have extravagant ornamentation (peacock feathers), and some have complex courtship rituals (bees dancing).
Are you born or made gay? In this essay I am going to explore the question are people born gay or made gay? Many scientists believe that there is a gene which determines whether someone is homosexual or not and other people believe that the way you are brought up makes a difference in your sexuality. The nature concept explores the idea of there being specific gene or combination of genes present at the time while a baby is in the womb that decides whether some people are born gay. One study shows that sexual orientation seems to be wired into the brains of nematode worms, and tweaking this sexual wiring can result in worms attracted to members of the same sex.
Sexual selection classified by Darwin. In humans, intersexual selection applies, involving members of one sex choose who they want to mate with from the opposite sex. Women choose partners and men compete. Sexy sons’ hypothesis: relates to inter sexual selection, showing women choose their partner depending on what features he has. She chooses the most desirable characteristics that her offspring might inherit.
The babies stay connected to the adult until it is old enough to go out on their own. If a sea anemone is torn apart by rocks, then each part becomes a new sea anemone. Other species are hermaphrodites producing both eggs and sperm. Sexual reproduction can occur with some species having separate sexes. In this case fertilized eggs develop into larvae, then settle on the sea bed and grow into young anemones.
Holofernes uses sex to keep himself and his fellow warriors happy. This is why the warriors would capture local women and bring them to their camp so that they could use them for the men’s sexual gratification. One example of the significance of sex in Judith is when Holofernes calls on his troops to bring Judith to his bed. “Then, corrupted by evil, he commanded that the blessed maiden should be hastily fetched to his bed, adorned with bracelets, decorated with rings (pg. 102, line 34, Judith).” Holofernes makes Judith be presented the way he wants in order to have sex with her.
Chronic alcohol use in male rats also has been shown to affect their reproductive ability and the health of their offspring. Key words: hypothalamic-pituitary-gonadal axis; reproductive effects of AODU (alcohol and other drug use); male; reproductive system; testicles; nitric oxide; oxidation; ethanol-to-acetaldehyde metabolism; apoptosis; luteinizing hormone-releasing hormone; fertility; opioids The endocrine system, which is made up of several hormone-producing organs throughout the body, is integral to all normal body functions, including growth, development, metabolism, and reproduction. This article reviews research on the effect of alcohol use on the part of the endocrine system involved in male reproduction, the hypothalamic-pituitary-gonadal (HPG) axis. This system of endocrine glands and hormones includes a brain region called the hypothalamus; the pituitary gland, located at the base of the brain; and the male gonads (testes). The article also highlights promising new strategies for preventing or reversing alcohol's harmful effects on the male reproductive system and describes research investigating the molecular mechanisms by which alcohol acts on this system.
Spiracles are found behind each eye on most species. Chondrichthyes show three types of reproduction. Oviparous, this is defined as a method of animal reproduction in which eggs are laid by the female and develop outside the body. It is the most familiar form of reproduction. Ovoviviparous, is a zoological term that refers to animals that produce eggs but retain them inside the female body until hatching occurs, so that "live" offspring are born.
An example of plant-animal pollination occurs between species of orchid and its pollinators. Orchids use various signals to attract male pollinators (Gaskett, 2010). They can do this by deceiving the pollinator through mimicking the female counterpart of the pollinator species. Smell, colour, and shape are all key to this type of deception. Orchids mimic the pheromones that would usually be released by females of the pollinator species – scent is essential to attract male pollinators over a long distance.