Essays Tagged: "fertilization"

Development of the Human Zygote

the first eight weeks of pregnancy. This period is called embryogenesis.During the first week after fertilization, which takes place in the Fallopian tube, the embryo starts to cleave once every twent ... he organ which produces sex cells. A chromosome may drop out of the dividing cell and thus be lost. Fertilization of this type of gamete results in a zygote with a missing chromosome. If the gamete fa ...

(10 pages) 251 0 4.1 Nov/1994

Subjects: Science Essays > Biology > Human Biology

Down Syndrome Report

is not yet known. Scientists assume that the reason for the abnormal chromosomal assortment is the fertilization of an ovum having 24 chromosomes by a sperm with a normal assortment of 23, but they h ...

(2 pages) 74 0 3.0 Feb/1997

Subjects: Humanities Essays > Health & Medicine > Diseases

Should surrogate motherhood be permitted?

roduce a large amount of sperm is not a problem. Once theegg and sperm are combined in a petri dish fertilization is verylikely to occur. The couple will then choose a surrogatemother and make an agre ...

(4 pages) 98 0 3.4 Mar/1997

Subjects: Law & Government Essays > Law

Biology Test on Discrete Particle of Inheritance Model

ual reproduction through generations of offspring. By manifesting gametes and consolidating them in fertilization a gauche model of what could happen will be produced. The model congregated is not tra ... duction of gametes and the fusion of the gametes. Recombination occurs during both processes.During fertilization the gametes fuse and the resulting zygote's genetic information is a new combination o ...

(7 pages) 81 0 4.7 Dec/1996

Subjects: Science Essays > Biology

Monkshood (an endangered plant). It's common names, description and the plant's disease

s and tubers with a germination period of twenty days. The plant is totally dependent upon bees for fertilization. The flowers are pollinated when bumblebees pry open the blossom to collect nectar and ...

(4 pages) 57 0 2.0 Oct/2002

Subjects: Science Essays > Biology > Plant Biology

Organism reproduction with an emphasis on meiotic cell disivion

called mitosis.The fusion of a sperm from the father and the egg cells from the mother is known as fertilization. The resulting fertilized egg is called a zygote, and is diploid. The zygote consists ... tic material is exchanged and rearranged and the sister chromatids no longer are homologous. Random fertilization of the egg by the sperm also greatly increase genetic variation.The probability of off ...

(4 pages) 60 0 4.0 Feb/2003

Subjects: Science Essays > Biology

Motor Development Autobiography, describe developmental stages based on real life experiences.

riods: Germinal, embryonic and period. The germinal period represents the first two weeks after the fertilization, where the ovum attached the uterine wall and the cell layers are formed. The embryoni ...

(15 pages) 227 4 4.8 May/2003

Subjects: Social Science Essays > Psychology

Woman's Curse?, Meredith F. Small, The Sciences, Jan/Feb 1999, pp. 24-29.

ls, menstruation does not occur; the discarded uterine lining is simply reabsorbed into the body if fertilization does not take place. In humans, as well as some higher primates, some of the shed endo ...

(2 pages) 65 0 3.2 Jun/2003

Subjects: Social Science Essays > Anthropology

Plant Physiology Mineral Nutrition Laboratory Report.

ral to modern agriculture and environmental protection. High agricultural yields depend strongly on fertilization with mineral elements. Mineral elements are acquired primarily in the form of organic ...

(13 pages) 96 0 2.3 Jun/2003

Subjects: Science Essays > Biology > Plant Biology

Human Female Reproductive Organs.

oup of cells formed in the ovary after the follicle ruptures during the release of the egg cell. If fertilization does not take place, the secretion of progesterone decreases and menstruation occurs. ... ne tube, or fallopian tube. If there are sperm from sexual intercourse (or artificial insemination) fertilization occurs . The ovum, either fertilized or unfertilized, then passes down the fallopian t ...

(2 pages) 67 0 5.0 Aug/2003

Subjects: Science Essays > Biology > Human Biology

History of Sex Research

ined term: "spermatozoa"-reasserted idea of male supremacy in reproduction*1873 Eduard van Beneden: fertilization the result of two half sets of chromosomes joining to form full set*354-430 St. August ...

(4 pages) 132 1 3.7 Jan/2004

Subjects: Science Essays > Biology > Human Biology

Biography on Dr. Ernest Everett Just an embryologist

rine Biological Laboratory, Dr. Ernest Everett Just conducted thousands of experiments studying the fertilization of the marine mammals. The research he had gathered at Wood Hole was used to publish h ... parthenogenesis, or a form of reproduction in which the ovum develops into a new individual without fertilization. Dr. Just decided to move and study in Europe in 1930 because of the racial difficulti ...

(1 pages) 28 0 3.0 Apr/2004

Subjects: Science Essays > Biology

The Origin of Species

on, and gametic isolation. Postzygotic barriers are barriers that fail the reproduction even though fertilization takes place and are isolating mechanisms that occur after fertilization. Postzygotic b ...

(3 pages) 77 0 4.3 May/2004

Subjects: Science Essays > Biology

'An Information Report On The Moreton Bay Fig' by Sakshi Kaushik

and walls. It belongs to the Moracease family and its scientific name is Ficus Macrophylla. After fertilization, the stalk turns oval, the colour is reddish brown and the flowers grow around the sta ...

(1 pages) 17 0 0.0 Jul/2004

Subjects: Science Essays > Biology

Difference between asexual and sexual

lls need to encounter each other togenerate the embryo of the new organism following fecundation or fertilization.Mitosis and meiosis are the two reproduction proceedings involved.Genetic recombinatio ...

(1 pages) 41 0 3.0 Jul/2004

Subjects: Science Essays > Biology

Technologies and the Family Genetic engineering Discuss how four types of genetic engineering can assist with human reproduction. State and describe how each process is performed.

ted on the website,, the average fertile couple holds an 80% probability of fertilization for any particular exposure of egg to sperm. However, by the time of the first menstru ... led to government legislation being implemented to control such technological advances as In Vitro Fertilization (IVF), Gamete Intra-Fallopian Transfer (GIFT), Cloning, and Intra-cytoplasm sperm inje ...

(6 pages) 66 1 5.0 Jul/2004

Subjects: Science Essays

Commidifcation of the clone.

lood type. When the extracted viable cell has grown to a certain size it is ready for implantation. Fertilization is not needed, for the cell already contains two sets of chromosomes. This cell is the ... his point I would like to draw attention to the costs of other reproductive alternatives. In vitro fertilization (IVF) costs $40 000-$50 000, artificial insemination costs up to $37 000 and egg donor ...

(15 pages) 79 0 5.0 Jan/2006

Subjects: Humanities Essays > Religion & Faith


ve a baby or not; especially in the case of a rape, because the woman has no responsibility for the fertilization. If abortion is made illegal, women who desperately do not want the baby may go to an ...

(4 pages) 84 3 2.8 Jan/2006

Subjects: Social Science Essays > Controversial Issues

Short piece on Emergency Contraception

osage of the birth control pill . It can contain progesterone, estrogen, or both . . It can prevent fertilization in the fallopian tubes by altering sperm and egg transport or by preventing or delayin ... conception as the "formation of a viable zygote by the union of the male sperm and the female ovum; fertilization" . . Even this definition leaves room for interpretation about whether or not a zygote ...

(5 pages) 35 0 4.3 Apr/2006

Subjects: Humanities Essays > Health & Medicine > Drugs


emia populations are often dominated by asexually reproducing females. The eggs lain do not require fertilization, and rapidly hatch to produce more females. At certain times the eggs may give rise to ...

(8 pages) 30 0 0.0 May/2006

Subjects: Science Essays > Biology