Genes are real things.
HI! You want to look at cells. You get a sample and you stain the cells with a dye. Which label is pointing to the nucleus? A: That is correct. B: No, this label points to the cell membrane. C: No, this label points to the inside of the cell. None of the labels point to the nucleus. No, one of these labels does point to the nucleus. The nucleus is the dark staining body in the cell. Your friend uses the same kind of cells but she decides to use a different dye. This is what she sees. Are these dark staining bodies nuclei? Yes. No, these are not nuclei. Each cell only has one nucleus. No. That is correct. Your friend used a different dye on this cell. The stained bodies are inconsistent; some cells have more, some have less. Your friend is staining something other than the cell nuclei. You both decide to stain more cells. You and your friend use both dyes on the same cell type. This is what you see with the double staining. The nucleus of each cell stains like it did before. The two of you also see other things staining in the cells. Your friend's dye is staining something other than the nuclei. Do you think these other bodies have something to do with inheritance? Yes. No, these other bodies are not the same for every cell. They probably don't have anything to do with inheritance. No. That is correct. Cells are the basic units of life. Each cell carries hereditary material found in the nucleus. CONGRATULATIONS! YOU'RE SO SMART!
cell nuclei, hereditary material, cell membrane, nucleus, dye, inheritance, genes, stain
- ID: 16227
- Source: DNALC.DNAFTB
DNAFTB Animation 7: Walther Flemming explains the phases of mitosis.
In 1882, Walther Flemming published the definitive study of the cellular process of mitosis.
(1 of 4) Photomicrograph of a cell dividing: nucleus is visible as dark staining organelle.
Professor Angelo De Marzo explains that special dyes are utilized to stain cells and when we look at the stained cells under the microscope we look for changes in the architecture of cells.
DNAFTB Animation 6: Hugo de Vries, Carl Correns, and Erich von Tschermak-Seysenegg explain the laws of heredity, and Theodor Schwann introduces cellular microscope discoveries.
Organelles in a typical animal cell.
Eugenics and sex harmony: The sexes, their relations and problems, by H.H. Rubin (1)
Signal transduction is cell communication that involves a series of molecular transformations.
The ability to create a clone used to be science fiction. Dr. Ian Wilmut's group changed that in 1997 with the creation of Dolly the sheep. Since then the debate on applying the technique to clone human beings has been ongoing. Based on all the discussio
The ability to create a clone used to be science fiction. Dr. Ian Wilmut's group changed that in 1997 with the creation of Dolly the sheep. Since then the debate on applying the technique to clone human beings has been ongoing.