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The terms "dominant" and "recessive" are used to describe the phenotypic expression of certain traits or characteristics an individual possesses and not the genes themselves. In humans, each gene has two copies, or allel... More »

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Dominant alleles are always expressed in the organism, while recessive traits tend to be expressed only when the dominant allele is not present. The relationship between dominant and recessive genes is described by the L... More »

www.reference.com Science Biology Molecular Biology & DNA

Different forms of the same gene are called alleles. A genetic locus is the spot on the chromosome where alleles for a specific gene can be found. Diploid organisms, including humans, have two alleles at each genetic loc... More »

www.reference.com Science Biology Molecular Biology & DNA
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Genetic recombination is the rearrangement of genes to produce offspring with different combinations of traits than either parent. Recombination is the source of genetic diversity in sexually reproducing organisms. More »

www.reference.com Science Biology Molecular Biology & DNA

The chemical factors that determine traits are called genes. With the exception of less than 1 percent of genes, the rest of the genes in people are the same. More »

www.reference.com Science Biology Molecular Biology & DNA

In terms of the human genome, the chromosome 7 pair represents more than 5 percent of all DNA and is estimated to contain up to 1,000 genes that are responsible for the production of proteins with cells, according to Gen... More »

www.reference.com Science Biology Molecular Biology & DNA

According to Kansas State University, heterozygous genotypes are those that feature non-identical alleles for a given pair of genes. The term is most often used to describe an organism that has one copy of a recessive ge... More »

www.reference.com Science Biology Molecular Biology & DNA