What was Nettie Stevens contribution to science?
Nettie Stevens, in full Nettie Maria Stevens, (born July 7, 1861, Cavendish, Vermont, U.S.—died May 4, 1912, Baltimore, Maryland), American biologist and geneticist who was one of the first scientists to find that sex is determined by a particular configuration of chromosomes.
What did Nettie Stevens conclude about gender from her mealworm studies?
While studying the mealworm, she found that the males made reproductive cells with both X and Y chromosomes whereas the females made only those with X. She concluded that sex is inherited as a chromosomal factor and that males determine the gender of the offspring.
Who did Nettie Stevens develop?
Nettie Maria Stevens (July 7, 1861 – May 4, 1912) 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.
Who determines the gender of the offspring?
The father has one X chromosome and one Y chromosome, can give either his X or Y chromosome. The egg (from the mother) already contains an X chromosome. Therefore the sex of a baby is determined by the X or Y chromosome of the sperm cell from the father.
What awards did Nettie Stevens get?
from Bryn Mawr, Stevens was given an assistantship at the Carnegie Institute of Washington in the year 1904–1905. Several subsequent studies of germ cells in aphids appeared as a result. One paper (1905) won Stevens an award of $1,000 for the best scientific paper written by a woman.
What do we call the mismatched chromosome pairs which Nettie Stevens found occur?
Across the species Nettie Stevens studied, she found many that contained what she expected to find after their first discovery in mealworms: a heteromorphic XY pair.
Who took credit for Nettie Stevens work?
However, scientists didn’t embrace her theory immediately. And today, Stevens almost never gets credit for making the discovery. The problem is that another male researcher, Edmund Wilson, made a similar discovery and published similar results around the same time as Stevens.
Who discovered chromosome in 1875?
“Walther Flemming: pioneer of mitosis research”.
Where did Nettie Stevens live?
Nettie Maria Stevens was born on July 7, 1861 in Cavendish, Vermont, USA. Her father was Ephraim Stevens, a carpenter. Her mother was Julia Adams, who died when Nettie was just two years old. In 1865 her father married Ellen Thompson.
Where was Nettie Stevens born?
Cavendish, VTNettie Stevens / Place of birth
Did Nettie Stevens win any awards?
What happens if you have a YY chromosome?
Involuntary movements. Low muscle tone hypotonia. Delayed development of motor skills (such as sitting and walking) Speech delay.
Can there be a YY chromosome?
Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob’s syndrome, XYY karyotype, or YY syndrome. According to the National Institutes of Health, XYY syndrome occurs in 1 out of every 1,000 boys.