History of Genetic Research Video Lessons

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Problem: In the 1920s, a dye was developed that bound to DNA and stained nuclei in direct proportion to the amount of DNA present in cells. Interestingly, all cells derived from the same multicellular organisms stained to the same levels. However, cells from different organisms absorbed different amount of stain. Gametes (sex cells - sperm and egg cells) absorbed half of the amount of dye as compared to the somatic cells (all other cells in the body except the gametes). Such experiments _____.A. demonstrated that somatic cells and gametes could not have differing amounts of DNA.B. demonstrated that all species had the same amount of nuclear DNA.C. provided circumstantial evidence that DNA is the genetic material.D. proved DNA is the genetic material.

FREE Expert Solution

In 1920s, fuchsin dye was found to be able to stain DNA. Eventually, it was discovered that DNA was found in the nucleus of all eukaryotic cells. By this time, Mendel's work is already known and studies were trying to determine the hereditary material that leads to the expression of the different traits. 

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Problem Details

In the 1920s, a dye was developed that bound to DNA and stained nuclei in direct proportion to the amount of DNA present in cells. Interestingly, all cells derived from the same multicellular organisms stained to the same levels. However, cells from different organisms absorbed different amount of stain. Gametes (sex cells - sperm and egg cells) absorbed half of the amount of dye as compared to the somatic cells (all other cells in the body except the gametes). Such experiments _____.

A. demonstrated that somatic cells and gametes could not have differing amounts of DNA.

B. demonstrated that all species had the same amount of nuclear DNA.

C. provided circumstantial evidence that DNA is the genetic material.

D. proved DNA is the genetic material.

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