"Studies in Spermatogenesis (Part 1 of 2)" by N. M. (Nettie Maria) Stevens is a scientific exploration of sperm development and sex determination in insects during the early 1900s. Stevens meticulously examines the chromosomes of insects such as termites and meal-worms and she describes in details the stages of sperm cell creation. The book reveals how specific parts of the chromosomes might determine if an insect will be male or female. With careful observations and staining methods, Stevens aims to show the critical actions of the "accessory chromosome" during cell division to understand it's role in reproduction, thereby advancing knowledge of genetics and evolution.
Studies in Spermatogenesis (Part 1 of 2)
By N. M. (Nettie Maria) Stevens
Discover the secrets of insect reproduction as a scientist races to understand how chromosomes dictate whether an insect is male or female.
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2010-03-07
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About the AuthorNettie Maria Stevens was an American geneticist who discovered sex chromosomes. In 1905, soon after the rediscovery of Mendel's paper on genetics in 1900, she observed that male mealworms produced two kinds of sperm, one with a large chromosome and one with a small chromosome. When the sperm with the large chromosome fertilized eggs, they produced female offspring, and when the sperm with the small chromosome fertilized eggs, they produced male offspring. The pair of sex chromosomes that she studied later became known as the X and Y chromosomes.
Nettie Maria Stevens was an American geneticist who discovered sex chromosomes. In 1905, soon after the rediscovery of Mendel's paper on genetics in 1900, she observed that male mealworms produced two kinds of sperm, one with a large chromosome and one with a small chromosome. When the sperm with the large chromosome fertilized eggs, they produced female offspring, and when the sperm with the small chromosome fertilized eggs, they produced male offspring. The pair of sex chromosomes that she studied later became known as the X and Y chromosomes.
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