Chromosomes essay

The Intrinsic and Extrinsic Barriers to Learning and Development The Intrinsic and Extrinsic Barriers to Learning and Development 11 November Motivation I have been given the task to talk to you about Inclusive education and the intrinsic and extrinsic barriers to learning and development. What is inclusive education? In line with international trends, South African education is moving away from special education towards a policy of inclusion i.

Chromosomes essay

Genes are segments of deoxyribonucleic acid DNA that contain the code for a specific protein that functions in one or more types of cells in the body.

Genes are contained in chromosomes, which are mainly in the cell nucleus. A chromosome contains hundreds to thousands of genes. A trait is any gene-determined characteristic and is often determined by more than one gene. Some traits are caused by abnormal genes that are inherited or that are the result of a new mutation.

Proteins are probably the most important class of material in the body. Proteins are not just building blocks for muscles, connective tissues, skin, and other structures. They also are needed to make enzymes. Enzymes are complex proteins that control and carry out nearly all chemical processes and reactions within the body.

The body produces thousands of different enzymes. Thus, Chromosomes essay entire structure and function of the body is governed by the types and amounts of proteins the body synthesizes. Protein synthesis is controlled by genes, which are contained on chromosomes. The phenotype typically differs somewhat from the genotype because not all the instructions in Chromosomes essay genotype may be carried out or expressed.

Whether and how a gene is expressed is determined not only by the genotype but also by the environment including illnesses and diet and other factors, some of which are unknown. Genes Humans have about 20, to 23, genes. DNA contains the code, or blueprint, used to synthesize a protein.

Genes vary in size, depending on the sizes of the proteins for which they code. Each DNA molecule is a long double helix that resembles a spiral staircase containing millions of steps.

The steps of the staircase consist of pairs of four types of molecules called bases nucleotides. In each step, the base adenine A is paired with the base thymine Tor the base guanine G is paired with the base cytosine C. Except for certain cells for example, sperm and egg cells and red blood cellsthe cell nucleus contains 23 pairs of chromosomes.

A chromosome contains many genes. A gene is a segment of DNA that provides the code to construct a protein. The DNA molecule is a long, coiled double helix that resembles a spiral staircase. In it, two strands, composed of sugar deoxyribose and phosphate molecules, are connected by pairs of four molecules called bases, which form the steps of the staircase.

In the steps, adenine is paired with thymine and guanine is paired with cytosine. Each pair of bases is held together by a hydrogen bond. A gene consists of a sequence of bases. Sequences of three bases code for an amino acid amino acids are the building blocks of proteins or other information.

Synthesizing proteins Proteins are composed of a long chain of amino acids linked together one after another. There are 20 different amino acids that can be used in protein synthesis—some must come from the diet essential amino acidsand some are made by enzymes in the body.

As a chain of amino acids is put together, it folds upon itself to create a complex three-dimensional structure. It is the shape of the folded structure that determines its function in the body.

Chromosomes essay

Because the folding is determined by the precise sequence of amino acids, each different sequence results in a different protein. Some proteins such as hemoglobin contain several different folded chains. Instructions for synthesizing proteins are coded within the DNA. The code is written in triplets.

That is, the bases are arranged in groups of three. Particular sequences of three bases in DNA code for specific instructions, such as the addition of one amino acid to a chain. For example, GCT guanine, cytosine, thymine codes for the addition of the amino acid alanine, and GTT guanine, thymine, thymine codes for the addition of the amino acid valine.Introduction Though perhaps best known throughout the world for his science fiction, Isaac Asimov was also regarded as one of the great explainers of science.

Jul 14,  · Your body also contains little packets of genetic material that sit on the ends of your chromosomes. They’re called telomeres.

Each time your cells divide, their telomeres get a .

Chromosomes essay

On the Outside Looking In is a 36 page chapbook containing 4 essays and 1 letter providing a trans woman's perspective on feminism and the exclusion of trans women from lesbian and women-only spaces, published June , Hot Tranny Action press (Oakland, CA).

*note: for my more recent thoughts, writings and rants related to the issue of trans woman-inclusion in lesbian and women-only . Family Tree DNA: Genetic Testing Service Get genetically tested to discover your relationship to other families, other Jews, and other ethnic groups.

Timeline allows students to create a graphical representation of an event or process by displaying items sequentially along a line.

Timelines can be organized by time of day, date, or event, and the tool allows users to create a label with short or long descriptive text. Meiosis and Homologous Chromosomes Essay Sample. 1. If the sperm cell of a fruit fly has 4 chromosomes, then the number of chromosomes in each body cell is: a.


Genes and Chromosomes - Fundamentals - Merck Manuals Consumer Version