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What Is Neoteny Or Paedogenesis?

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Introduction – The attainment of sexual maturity leading to reproduction in larval stage is called Neoteny or Paedogenesis. Neoteny is also known as juvenilization. The term neoteny was coined by Kollwan (1882). It results from natural selection favoring delay in the maturation of somatic tissue while the time needed for maturation of the gonads remains constant. (In other words, somatic development stops earlier than it did in their ancestors. Neoteny can be favored by natural selection when there is an advantage to retaining the larval body plan for longer periods of time (over many generations) and the advantage is not attainable by the adult body plan. Examples: Cryptobranchoidea, Amphiumidae. Metamorphosis of larva into adult is retarded. Neoteny …show more content…

*In such cases, larvae become sexually functional and under favourable condition metamorphose into adults. *This type of neoteny includes sexually mature axolotl larvae of Ambystoma. Factors influencing neoteny –*Research indicates that neoteny occurs because the hypothalamus of the brain fails to produce the hormone that causes the pituitary to stimulate the thyroid gland to produce growth hormones that trigger metamorphosis. Several internal and external factors are responsible for neoteny, a rare unusual event. *Several internal and external factors are responsible for neoteny, a rare unusual

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A similar phenomenon was explained in Emily Martin’s The Egg and the Sperm. She discusses how “Western science” explains reproduction in a culturally constructed fashion. The language used to describe gametes and other sexual organs ultimately depicts sperm as “active” and “strong” in contrast to the egg being “passive” and “dormant” (Martin 489-450). The language used by scientists to describe reproductive organs is not chosen to satisfy religious beliefs, but analogously the language represents stereotypical male-female roles. Both cases show how “biology itself is shaped by historical and material processes” (Roberts 115).

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Females invest more and make few large, expensive eggs. For example, when a male honeybee reaches his climax, he explodes, his genitals ripped from his body with a loud snap. In Chapter 2 of the expense is damnable, almost all individuals of C. Elegans are female hermaphrodites, and a small minority, around one in a thousand, are certain true males, Based on XO sex alles (Hermaphrodites have XX) this would conclude that when self-inseminated, a common worm would lay birth to 300 eggs. In Chapter 3 Fruits of knowledge, this chapter shows the main importance of what are the important female roles when it comes to sexual reproduction. Females in many other species insist on trading sex for food, but in this situation, in species where females swap sex for food, loose females typically eat better and have more offspring.

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The Painted Lady Butterfly Experiment provides an insightful journey into the life cycle of these fascinating creatures. In this extended exploration, we delve deeper into the stages of their development, the minimalistic requirements for their sustenance, and the transformative process of metamorphosis. Our experiment commenced with the acquisition of two caterpillars at the larva stage, midway through their life cycle. Housed in a container with a nutritious, orange-colored substance at the bottom, the caterpillars steadily grow each passing day. Their voracious appetite led them to consume the food provided, a vital source of energy for their rapid development.

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The Asteroidea class, also known as the sea stars, has many common characteristics. Firstly, all sea stars have flat, star-shaped bodies as well as a central disc with radiating arms/rays protruding out. Typically, seastars has five arms but certain species can have up to fifty arms! The size of the sea stars is not consistent through the different species therefore varies from one centimeter to three feet. The skeletal system is a key aspect for the survival of a sea stars.

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In both cases, the organism is changing forms entirely instead of merely shrinking. We see butterflies so often we know every part of their life cycle and none of it is a mystery to us. On the other hand, we know very little about jellyfish and do not observe their life cycle on a daily basis. Because of this, it was ingenious for the author to include this comparison. I also really like the use of the word “metamorphosis”.

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