Categories : Genetics. Since most trisomies are lethal, the fetus only survives because it loses one of the three chromosomes and becomes disomic. Variation in Function of Sex Chromosomes. Gaining a single chromosome, in which the daughter cell s with the defect will have one chromosome in addition to its pairs is referred to as a trisomy.
The Chromosome Number of Man. Graham, Murray L.
Such patients have non-specific features e. Can occur in two ways:. The extra sex chromosomes do not accentuate the sexual characteristics, and the individual is usually infertile. Women with triple X usually are fertile.
Advertisement Hide. Categories : Genetics. The Fetal Alcohol Syndrome. Lenz, Hamburg, on the lecture by R. Calvin Bridges and Thomas Hunt Morgan are credited with discovering nondisjunction in Drosophila melanogaster sex chromosomes in the spring ofwhile working in the Zoological Laboratory of Columbia University.
Variation in Function of Sex Chromosomes. Advertisement Hide. Front Matter Pages Download as PDF Printable version.