Essays Tagged: "Zygote"

Development of the Human Zygote

November 16, 1995Hundreds of thousands of times a year a single-celled zygote, smaller than a grain of sand, transforms into an amazingly complex network of cells, a newbo ... y 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 fails to split equally at meiotic division and the c ... ails to split equally at meiotic division and the cell with the extra chromosome is fertilized, the zygote becomes trisomic (Pritchard, MacDonald, and Gant, 1985). Down Syndrome, the most common chrom ...

(10 pages) 251 0 4.1 Nov/1994

Subjects: Science Essays > Biology > Human Biology

Life-span development chap 4 notes

I.Prenatal DevelopmentA.Germinal Period - Conception to 2 weeks1. Creation of the zygote2. Continued cell division3. Implantation - attachment of the zygote to the uterine wall (10 d ... on1. Cell differentiation intensifies, support systems for cells form and organs appears2. Attached zygote becomes embryo* Endoderm (digestive/respiratory systems)* Mesoderm (circulatory system, bones ...

(2 pages) 66 0 3.7 Sep/2002

Subjects: Social Science Essays > Psychology

This is an essay about abortion. It is well researched and has many good points. This is an excellant paper

ld possibly be the death penalty. However, the question that truly forms the debate is this: Is the zygote really a human being? Surely there are signs that show life, but is it developed enough to fu ... see if it is legally possible to ban abortion, or let it freely take place. The question is if the zygote or fetus should be considered a live being or not. Finally, what you believe is your choice. ...

(5 pages) 225 3 4.4 Jan/2003

Subjects: Law & Government Essays > Law > Issues

Organism reproduction with an emphasis on meiotic cell disivion

d the egg cells from the mother is known as fertilization. The resulting fertilized egg is called a zygote, and is diploid. The zygote consists of two haploid sets of chromosomes, one from the mother ...

(4 pages) 60 0 4.0 Feb/2003

Subjects: Science Essays > Biology

Is Abortion Immoral?

h that we have responsibilities to the?" (Martin, 127) According to conservatives ("pro-life"), the zygote is human because it contains forty-six chromosomes and is the product of two human beings. Th ... ls are not human beings (Martin, 130). The second argument of the conservatives begins not with the zygote, but with the point at which everyone will agree there is a person. For the most part, all pe ...

(5 pages) 232 3 4.0 Mar/2003

Subjects: Humanities Essays > Health & Medicine > Sex & Sexuality

*Explain and give examples of how physical development changes during conception, infancy, childhood, adolescence, and adulthood.

to be the germinal period, the first two weeks of conception. During this period the embryo and the zygote have started to form. The embryonic period, also known as the prenatal period, follows two to ...

(4 pages) 232 0 3.8 Mar/2003

Subjects: Humanities Essays > Health & Medicine

This essay is about abortion. It uses many quotes from doctors and scientists arguing pro-choice.

tus have to be known for one to be sure on whether abortion is wrong. A fertilized ovum is called a zygote and it reaches the uterus only in 3-4 days. It floats freely in the woman's body for 48 hours ...

(8 pages) 118 0 4.5 Apr/2003

Subjects: Social Science Essays > Controversial Issues

How is sex determined in Drosophila and Humans?

he organism, and these fates vary according to the location of the cell in relation to the original zygote cell. Protein signals from this central cell control the cell division and specialisation of ...

(8 pages) 57 0 2.0 May/2003

Subjects: Science Essays > Biology > Human Biology


right, however pro-choice groups believe that an abortion is only preventing a collection of cells (zygote) from developing into a baby, and women should have the choice and control over its life.In m ...

(9 pages) 115 0 3.0 Jun/2003

Subjects: Law & Government Essays > Civil Rights > Women's Studies

Genetics of Ascospore Color in Sordaria lab

diverse ascospores. Eight ascospores can be found lined up in a row in the asci; they form a single zygote, which is diploid.These arrangements provide scientists to study genetic recombination. The g ...

(4 pages) 70 0 5.0 Aug/2003

Subjects: Science Essays > Biology

The Origin of Species

r the mating of two members of different species and are isolating mechanisms that occur prior to a zygote being formed. Prezygotic barriers include temporal isolation, habitat isolation, behavioral i ...

(3 pages) 77 0 4.3 May/2004

Subjects: Science Essays > Biology

Nursing case study

egnancy is a potentially life-threatening form of pregnancy. It occurs when the implantation of the zygote is outside the uterine cavity (Walker & Jones 2002). The commonest location is within the ...

(10 pages) 576 1 4.5 Jun/2004

Subjects: Humanities Essays > Health & Medicine

Key Points about the Cell Cycle and Cancer

ore pausing in "G1" and specializing. These cells, all formed by mitosis, are genetic clones of the zygote and of all the stem cells that do not specialize. They still have all the genes necessary to ...

(7 pages) 63 1 4.7 Jul/2004

Subjects: Science Essays > Biology

Essay on reproductive isolating mechanisms (1500 words)

c isolating mechanisms are those mechanisms that isolate species before fertilisation i.e. before a zygote is formed. They include geographical, ecological, temporal, ethological, mechanical, morpholo ... ms lesson the possibility of gametes from different species coming into contact and hence forming a zygote.One prezygotic isolating mechanism is ecological isolation, also referred to as habitat isola ...

(6 pages) 32 0 3.0 Sep/2004

Subjects: Science Essays > Genetics & Genome Projects

Poem of an Yeast Cell's Life

s screwed!He meets an HA2,Bob will now turn into a haploid shmoo.He kisses his mate and an unbudded zygote forms,They're just submitting to the norms.Look! Something appeared in their middle!It just w ... y're just submitting to the norms.Look! Something appeared in their middle!It just wiggled!A budded zygote is there,Diploid Bob has just fared.Now, his ability to make tryptophan is complete,For Bob, ...

(1 pages) 25 0 0.0 Oct/2004

Subjects: Science Essays > Biology


ime greater than that. Unborn babies inside the womb are human like us, right when they are still a zygote that is when a diploid cell formed as a result of fusion of two haploid nuclei during sexual ...

(4 pages) 81 5 3.5 May/2005

Subjects: Social Science Essays > Controversial Issues

Genetic Screening.

arefully extracted. These cells are genetically identical to the fetus as they are derived from the zygote. Therefore these cells can be studied and checked for any defects. This method can be used ve ... etic is needed in this case. Again, the cells of the amniotic fluid contains cells derived from the zygote and so screening of these cells will be able to determine if any genetic defects are present. ...

(1 pages) 24 0 2.3 Oct/2005

Subjects: Science Essays > Biology

Carrot Regeneration.

f totipotency, which allows nonembryonic organ or cell to develop along a path similar to that of a zygote in which a new organism is formed identical to the previous organism that the cell came from. ...

(1 pages) 3051 0 3.0 Dec/2005

Subjects: Science Essays > Environmental Science

Complete IGCSE 2005 Biology Syllabus.

elingsReproduction: Sexual Intercourse, production of a new cell, by union of sperm and egg to form zygoteGrowth: Ability of to reproduce and replace cellsMovement: Ability to move and grow in directi ... tion involves two organisms, the union of an egg and sperm, which will result in the formation of a zygote.SupplementThe advantage is that if two strong animals reproduce a stronger animal will be cre ...

(26 pages) 92 0 4.3 Dec/2005

Subjects: Science Essays > Biology

Implantation & Functions Of The Placenta

The zygote created from fertilization travels down and through the oviduct, dividing by nuclear and cell ...

(2 pages) 10 0 0.0 Feb/2002

Subjects: Science Essays > Biology