Early Onset AD: DNA, Chromosomes and Genes

Numéro d’image : 12628550
Early Onset AD: DNA, Chromosomes and Genes
Genetic mutations in a cell can lead to abnormal proteins and, in turn, diseases such as early-onset Alzheimer's disease. The nucleus of almost every human cell contains a blueprint that carries the instructions a cell needs to do its job. The blueprint is made up of DNA (deoxyribonucleic acid), which is present in long strands that would stretch to nearly 6 feet in length if attached end to end. The DNA is packed tightly together with proteins into compact structures called chromosomes. Normally, each cell has 46 chromosomes in 23 pairs, which are inherited equally from a person's biological parents. The DNA in nearly all cells of an individual is identical. Each chromosome contains many thousands of segments, called genes. People inherit two copies of each gene from their parents, except for genes on the X and Y chromosomes, which, among other functions, determine a person's sex. The genes instruct the cell to make unique proteins that, in
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Crédit: Science Photo Library / NIH / National Institute on Aging
Taille de l’image : 3950 px × 3450 px
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