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Nettie Stevens's Research and Impact

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Questions and Answers

Which of these is NOT a true statement about Nettie Stevens's work?

Stevens's research was overshadowed by the work of Edmund Beecher Wilson, who also researched sex determination.
She was the first to identify the X and Y chromosomes in human reproductive cells. (correct)
Her work established the link between specific chromosomes and sex.
She studied mealworms to investigate their chromosomal behaviour.
She provided the first scientific link between specific chromosomes and an organism's sex.

Which of these statements about Nettie Stevens's research methodology IS TRUE?

She primarily utilized genetic sequencing to analyze chromosomal behavior in mealworms.
Stevens used complex mathematical models and statistical analysis to track chromosomal changes in mealworms, which provided the foundation for her groundbreaking discovery.
Stevens's research solely relied on observational techniques, focusing on microscopic examination of reproductive cells. (correct)
Her work involved a combination of both microscopic analysis and genetic sequencing techniques, allowing for a detailed understanding of chromosomal behaviour in mealworms.

What was the primary reason why Stevens's research on sex determination was considered groundbreaking?

She was the first to use microscopy to study chromosomal behavior in animals.
She discovered that sex is determined by genes located on specific chromosomes.
Stevens was the first to challenge the prevailing view that sex was determined by external factors during embryonic development, providing strong evidence for chromosomal inheritance. (correct)
Her work refuted previous theories on sex determination, which argued that environmental factors during embryonic development are solely responsible for an organism's sex.

What was the main reason Stevens did not accept the research professorship at Bryn Mawr?

<p>Health problems prevented her from accepting the job. (B)</p> Signup and view all the answers

Which of the following statements best reflects the significance of Stevens’ research on sex determination?

<p>Her research provided compelling evidence that the inheritance of specific chromosomes is crucial for determining an organism's sex. (B)</p> Signup and view all the answers

Flashcards

Nettie Stevens

Early 20th-century biologist known for sex determination studies.

Sex determination

Process by which an organism's sex is established via chromosomes.

Mealworm Study

Research on chromosomal behavior in mealworms led by Stevens.

Chromosomal inheritance

Theory that traits are passed through chromosomes from parents.

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Thomas Hunt Morgan

Mentor of Stevens, notable geneticist known for studies on heredity.