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A long molecule that looks like a twisted ladder. It is made of four types of simple units and the ... Traits determined by genes can be modified by the animal's surroundings (environment): for example, the ... Chromosomes all contain DNA made up of four nucleotides, abbreviated C (cytosine), G (guanine), A (adenine), or T ...


A gene a locus (or region) of DNA which is made up of nucleotides and is the molecular unit of ... Most biological traits are under the influence of polygenes ( many different genes) as well as gene–environment interactions. .... In addition to genes, eukaryotic chromosomes contain sequences involved in ensuring that the  ...


A gene is the basic genetic unit that is used to code for something (proteins, usually). How different genes interact determines things like what you look like, etc.


A chromosome contains hundreds to thousands of genes. ... Some traits are caused by abnormal genes that are inherited or that are the result of a new mutation. Proteins ... The phenotype is the actual structure and function of a person's body.


Find information, videos, and activities about DNA, genes, chromosomes, the building ... DNA is made out of two long, twisted strands that contain complementary ... a tour of a typical human cell, moving from larger to smaller cell structures (i.e., from ... tutorials on DNA, genes, chromosomes, protein, heredity, and traits.


They contain the information our bodies need to make chemicals called proteins. Proteins form the structure of our bodies, as well playing an important role in ...


It is composed of DNA (deoxyribonucleic acid), which contains genetic ... Genes determine traits because they function as a code that tells structures in the ...


A chromosome is a structure that occurs within cells and that contains the cell's genetic material. ... he assumed that genetic traits were somehow transmitted from parents to ... The job of genes in a DNA molecule, therefore, is to tell cells how to ...


Today, most scientists agree that genes correspond to one or more DNA ... into structures called chromosomes, and that somatic cells contain twice as many ...


Each cell in the human body contains about 25,000 to 35,000 genes. Genes carry the information that determines your traits (say: trates), which ... Genes are found on tiny spaghetti-like structures called chromosomes (say: KRO-moh- somes).