Nettie Stevens and Sex Determination
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Questions and Answers

What specific discovery did Nettie Stevens make regarding sex determination?

  • Males have two Y chromosomes while females have one X and one Y.
  • Chromosomes have no impact on an organism's physical traits.
  • An animal's sex is determined by specific chromosomes. (correct)
  • Sex is determined by environmental factors during embryonic development.

    • During which period did Nettie Stevens conduct her research on mealworms?

  • 1900 to 1910
  • 1905 to 1912
  • 1896 to 1900
  • 1904 to 1905 (correct)

    • What was a major consequence of Stevens' findings on sex determination?

  • They confirmed that sex is entirely determined by environment.
  • They suggested that sex determination is random and not chromosomal.
  • They changed the understanding of gender roles in society.
  • They established a connection between chromosomes and physical traits. (correct)

    • What academic achievement did Nettie Stevens accomplish in 1903?

    <p>She earned her PhD. (D)</p> Signup and view all the answers

    What did Thomas Hunt Morgan state regarding Nettie Stevens' work?

    <p>Her work will be remembered. (A)</p> Signup and view all the answers

    Which aspect of Nettie Stevens' research was often overlooked during her lifetime?

    <p>Her role as a female scientist. (B)</p> Signup and view all the answers

    What offered life-changing opportunities to Nettie Stevens that she had to decline?

    <p>A research professor role at Bryn Mawr. (C)</p> Signup and view all the answers

    Which of the following summarizes the significance of Stevens' findings?

    <p>They established a clear link between chromosomes and biological sex. (C)</p> Signup and view all the answers

    Flashcards

    Environmental Sex Determination

    The idea that a person's sex is determined by external factors during embryonic development.

    Chromosomal Sex Determination

    A process where sex is determined by specific chromosomes, typically X and Y, inherited from parents. This is the primary mechanism in most mammals, including humans.

    Pioneering Scientist

    A scientist who challenges established ideas and makes groundbreaking discoveries, often facing initial resistance.

    Chromosome

    A microscopic structure in cells that carries genetic information. This information determines inherited traits.

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    Chromosomal Behavior

    The process of studying how chromosomes behave during cell division, especially during reproduction.

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    Microscopic Study of Reproductive Cells

    A microscopic study of reproductive cells to explore the inheritance of traits.

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    Chromosomal Inheritance

    A term describing the transfer of characteristics (traits) from parents to offspring through their genes carried on chromosomes.

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    Mealworm

    A type of beetle that Nettie Stevens used in her experiments to understand chromosomal behavior and sex determination.

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