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Educational Resources
A germ line is the sex cells (eggs and sperm) that are used by sexually reproducing organisms to pass on genes from generation to generation.
germ line … a germ line is the sex cells (eggs and sperm) that are used by sexually reproducing …
Educational Resources
A somatic cell is any cell of the body except sperm and egg cells.
… somatic cells … a somatic cell is any cell of the body except sperm … and egg cells . … cell , chromosome, diploid, mutation, germ line … a somatic cell is any cell of the body except …
Educational Resources
Bacteria are small single-celled organisms.
… and in fact is estimated to contain more bacterial cells than human cells . most bacteria in the body are …
Educational Resources
Crossing over is the swapping of genetic material that occurs in the germ line.
… is the swapping of genetic material that occurs in the germ line. … genetic material, chromosomes, meiosis, dna … in the germ line. during the formation of egg and sperm cells , also known as meiosis, paired chromosomes from each …
Educational Resources
Transgenic means that one or more DNA sequences from another species have been introduced by artificial means.
… … cell , cloning, deoxyribonucleic acid (dna), gene, germ line … transgenic means that one or more dna sequences …
Educational Resources
A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses.
… or infection by viruses. … mutation, dna sequence, germ line, gene … a mutation is a change in a dna sequence. … on to offspring, while somatic mutations occur in body cells and are not passed on. … educational resources …
News Release
In a study published in the journal Science, collaborators at NHGRI, the National University of Ireland, Galway, and the Whitney Laboratory for Marine Bioscience at the University of Florida, Augustine, reported that activation of the gene Tfap2 in adult stem cells in Hydractinia can turn those cells into germ cells in a cycle that can repeat endlessly.
… are shown in yellow; cell nuclei are in turquoise.  germ cell induction and all stages of gametogenesis can be … called hydractinia, does so because it produces germ cells , which are precursors to eggs and sperm, nonstop …
Genetic Disorders
Klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. The most common symptom is infertility.
… being the xy/xxy mosaic. in this variation, some of the cells in the male's body have an additional x chromosome, and … risk for breast cancer, a rare tumor called extragonadal germ cell tumor, lung disease, varicose veins and …
Fact Sheets
A biological pathway is a series of actions among molecules in a cell that leads to a certain product or a change in the cell.
… work together at many different levels - from organs to cells to genes. from both inside and outside the body, cells
Staff
Dr. Andy Baxevanis is a senior scientist leading NHGRI's Computational Genomics Unit.
… possess complex cell types such as neurons and muscle cells , are our oldest animal relatives – even predating the … have found that the mechanism used by hydractinia to make germ stem cells – the progenitors to eggs and sperm – is …