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Describing chromosomes
Describing chromosomesA black and white sketch shows chromosomes in a single dividing cell. The cell has an oviform shape. Anterior and posterior poles at the top and bottom of the cell are represented by several small dots. Thin lines, representing spindle microtubules, originate from both poles and extend toward the middle of the cell. Several chromosomes, which resemble worms, are aligned at the cell's equator.
Describing chromosomesA black and white sketch shows chromosomes in a single dividing cell. The cell has an oviform shape. Anterior and posterior poles at the top and bottom of the cell are represented by several small dots. Thin lines, representing spindle microtubules, originate from both poles and extend toward the middle of the cell. Several chromosomes, which resemble worms, are aligned at the cell's equator.Figure 3: Sample image from Walther Flemming's drawings of chromosome behavior during mitosis.
Describing chromosomesA black and white sketch shows chromosomes in a single dividing cell. The cell has an oviform shape. Anterior and posterior poles at the top and bottom of the cell are represented by several small dots. Thin lines, representing spindle microtubules, originate from both poles and extend toward the middle of the cell. Several chromosomes, which resemble worms, are aligned at the cell's equator.Figure 3: Sample image from Walther Flemming's drawings of chromosome behavior during mitosis.In 1882, German biologist Walther FlemmingThe first words for genes: Elementen and gemmules
FlemmingThe first words for genes: Elementen and gemmulesThe Original Thinkers
FlemmingThe first words for genes: Elementen and gemmulesThe Original ThinkersWho was Gregor Mendel?
FlemmingThe first words for genes: Elementen and gemmulesThe Original ThinkersWho was Gregor Mendel?The life and legacy of Charles Darwin
FlemmingThe first words for genes: Elementen and gemmulesThe Original ThinkersWho was Gregor Mendel?The life and legacy of Charles DarwinResearchers began hypothesizing about the existence of genes as early as the mid-1800s — although they used different terminology than today's scientists when doing so. For example, during the 1860s,What is a gene?
What is a gene?Physically, a gene is a segment (or segments) of a chromosome. Functionally, a gene can play many different roles within a cell. Today, most scientists agree that genes correspond to one or more DNA sequences that carry the coding information required to produce a specific protein, and that protein in turn carries out a particular function within the cell. Scientists also know that the DNA that makes up genes is packed into structures called chromosomes, and that somatic cells contain twice as many chromosomes as gametes (i.e., sperm and egg cells).what questions do you have about the relationship between chromosomes and DNA in terms of how traits are inherited? was the first person to describe what scientists now know as chromosomes. Flemming's elegant drawings showed how chromosomes aligned and were eventually pulled apart during mitosis (Figure 3). Then, in 1914, another German researcher named Theodor Boveri provided the first descriptions of meiosis, also supported by detailed drawings, except these drawings showed how the number of chromosomes in a parent cell was reduced by half in the resulting gametes.