Page 1 of 20 - About 191 Essays
  • Male And Female Gamete Differences

    What is mate choice? How did it evolve and why does it differ between sexes? To answer these questions, we first have to understand what it means to be female and what it means to be male under evolutionary standards and how the two sexes contribute to reproduction. Under biological terms, a female is the sex that produces the ova or egg, which is the larger sex gamete. The egg is large because it contains nutrients and material needed for the development of offspring as well as the DNA of the mother(Gilbert 2000). Meanwhile, a male is defined as the sex that produces the sperm, which is the smaller gamete. The sperm is composed solely of a haploid nucleus (DNA) and a propulsion system that allows it to travel to the egg (Gilbert 2000). The…

    Words: 1190 - Pages: 5
  • Sea Urchin Gametes Lab Report

    Introduction Sea urchin gametes are an excellent model for observing vertebrate development. Sea urchins are a low cost species that can be maintained in a laboratory environment, have external fertilization and have distinct stages for viewing development in offspring. They are external breeders, so when the gametes are mature, they are released into seawater. The seawater carries the gametes where they will fertilize and develop. How does the sperm find the eggs? The jelly coating on the…

    Words: 1147 - Pages: 5
  • Essay On Nuclear Transplantation Cloning

    Nuclear Transplantation Cloning Nuclear transplantation cloning is a way of reproducing when one is unwilling or unable to use gametes. A procedure can remove the nucleus from an oocyte and replace it with a nucleus from a somatic cell. Then, a stimulus will cause the egg cell to start replicating. The gestation part is the same as with anyone conceived; one will be gestated for nine months before birth. There are controversial views on cloning, with Kass strongly opposing the idea. One…

    Words: 2093 - Pages: 9
  • Ethical Issue Of Paraplegia Essay

    The stomach stores swallowed food and liquid. The acid in the stomach breaks down the food and liquid until it empties into the small intestine. The small intestine mixes the food and liquid with digestive juices from the pancreas, live and intestine and pushes into the large intestine (NIDDK, 2016). The large intestine is in control of the waste products. The large intestine absorbs water from the and any other nutrients and then it goes from liquid to stool (NIDDK, 2016). Reproductive System …

    Words: 1483 - Pages: 6
  • Male And Female Reproductive System Essay

    system includes mostly external organs, produces testosterone, and produce sperm during puberty, while the female reproductive system includes mostly internal organs, produces progesterone and estrogen, and produces a set number of eggs in the womb during embryonic development. The reproductive systems, however, share one common similarity in which both systems have gonads that produce gametes and other sex organs. The first difference between the male and female reproductive systems is that…

    Words: 1117 - Pages: 5
  • Quantum Dots Essay

    Nano-dots in Mammalian Gametes Imagining1 The Nano-dots, or Quantum Dots (QD), are nano-scale semiconductor devices with diameter up to 10nm, which were first discovered in 1980s2. Once stimulated, they give emission of light with specific colours, which is then visualised1-3. These nano particles have high size-tunability, once illuminated, different emission wavelength can be obtained by manipulating the size of dots3. Inorganic QDs are made up of two components, an atom-cluster core with…

    Words: 812 - Pages: 4
  • Key Events In Human Reproduction

    However, fertilisation can take place during this process. Fertilisation is the joining of a male and female haploid gamete. Haploid means that the sex cell contains one half of the chromosomes (23 pairs) and half of the genetic information of the body cell. The female sex cell is the oocyte, and the male is the sperm cell. These join to form a diploid zygote, which has 46 chromosomes, two sets of 23 chromosomes from the male and female gamete. The zygote then goes on to become an embryo. (BBC,…

    Words: 1183 - Pages: 5
  • Essay On Sexual Reproduction

    reproduce offspring that will carry on your history after you pass away. Reproduction occurs when a male and female get intimate with each other. The only way that could happen is if they really prefer each other. Preferences for sexual reproduction started with Darwin when he proposed “sexual selection” rather than natural selection (Buss and Barnes, 1986). This occurred when Darwin saw an evolutionary change in peacocks that was not for survival, but to attract mates for reproduction (Buss and…

    Words: 1553 - Pages: 7
  • Root System Of Hibiscus

    green and it move to light brown towards the roots system. The stem carries water and minerals from the leaves throughout the plants. In the root system they have the primary root, lateral root, and root tip. Root tip has root hairs, and root cap. The roots have a brownish tint to them. The root comes in random of sizes and placements. The functions of the roots are to anchor and support plants (Plant Structures: Stems, CMG GardenNotes). The root can absorb and conduct water minerals and also…

    Words: 780 - Pages: 4
  • Methoxychlor Pesticide

    rapid development and their aquatic nature, sea urchins may be particularly sensitive and useful for studying the effects of environmental toxicants on early development. Materials and Methods Harvesting and Culturing Cells/Embryos/Eggs/Sperm Sea urchins were inverted, oral side facing upward, Aristotle’s lantern and the peristomial membrane visible. Urchins were injected with 2 mL of 0.53M KCl through the peristomial membrane into the perivisceral cavity to induce spawning. To optimize…

    Words: 1494 - Pages: 6
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