Podcast
Questions and Answers
Nettie Stevens's research primarily focused on which area of biology?
Nettie Stevens's research primarily focused on which area of biology?
- Embryonic development in mammals
- Microbial evolution
- Sex determination in animals (correct)
- Plant genetics
What was the prevailing belief about sex determination before Stevens's research?
What was the prevailing belief about sex determination before Stevens's research?
- Sex was determined solely by the mother's genetic contribution.
- Sex was predetermined at conception by a combination of genetic and astrological factors.
- Sex was determined by environmental factors during embryonic development. (correct)
- Sex was randomly assigned at birth.
Which organism did Stevens primarily use in her pivotal sex determination studies?
Which organism did Stevens primarily use in her pivotal sex determination studies?
- Mealworms (correct)
- Pea plants
- Mice
- Fruit flies
What year did Nettie Stevens publish her groundbreaking discovery about sex determination?
What year did Nettie Stevens publish her groundbreaking discovery about sex determination?
What was the significance of Stevens's discovery in the broader context of genetics?
What was the significance of Stevens's discovery in the broader context of genetics?
Who supervised Stevens during her Doctoral Program?
Who supervised Stevens during her Doctoral Program?
What did Stevens observe regarding mealworm chromosomes?
What did Stevens observe regarding mealworm chromosomes?
Which institution funded Stevens's research on chromosomal behavior?
Which institution funded Stevens's research on chromosomal behavior?
What was the immediate consequence of Stevens's research in the scientific community?
What was the immediate consequence of Stevens's research in the scientific community?
Which degree did Nettie Stevens obtain from Stanford University?
Which degree did Nettie Stevens obtain from Stanford University?
Flashcards
Nettie Stevens
Nettie Stevens
A pioneering US biologist known for her research on sex determination.
Chromosomes
Chromosomes
Structures within cells that carry genetic information, including sex determination.
Sex Determination
Sex Determination
The biological process that defines an organism's sex through chromosomes.
X and Y Chromosomes
X and Y Chromosomes
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Chromosomal Inheritance
Chromosomal Inheritance
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Mealworm Study
Mealworm Study
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Stanford University
Stanford University
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PhD from Bryn Mawr College
PhD from Bryn Mawr College
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Groundbreaking Discovery
Groundbreaking Discovery
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Thomas Hunt Morgan
Thomas Hunt Morgan
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Study Notes
Nettie Stevens: Pioneer Geneticist
- Early 20th-century US biologist, Nettie Stevens, made a groundbreaking discovery about sex determination in animals.
- Her discovery revealed that an animal's sex is determined by specific chromosomes.
- She was among the first female scientists to make significant contributions to genetics.
- Despite her crucial work, her contributions were largely overlooked during her life.
Stevens's Research
- Stevens focused on the role of chromosomes in sex determination.
- She studied the behavior of chromosomes in mealworms.
- Observations showed that male cells have X and Y chromosomes, while females only have X chromosomes.
- This observation led her to the conclusion that an organism's sex is determined by the chromosomes inherited from each parent.
Recognition and Impact
- She published her research on sex determination in 1905, predating another prominent geneticist in the field.
- However, broad recognition of Stevens's vital work came after her death.
- Her work established a critical link between a physical characteristic (sex) and specific chromosomes.
- Her studies focused on reproductive cells across various insect species.
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