In humans and many other animals, specific chromosomes determine sex. But how did researchers discover these so-called sex chromosomes? The Sex of Offspring Is Determined by Particular Chromosomes ...

Baker's yeast, an important model for designer biology, is already used to make beer, biofuel and medicine, but once equipped with a full set of synthetic and changeable chromosomes like those ...

Hansemann 1 first suggested in 1890 that cancer might be related to alterations of the chromosome set, and this early statement has been substantiated many times. Older work described high division ...

Finding a new species is a rare event in easy-to-see and well-studied organisms like butterflies, especially if they inhabit well-explored areas such as Europe. Researchers have now discovered the ...

Complex organisms have complex genomes. While bacteria and archaea keep all of their genes on a single loop of DNA, humans scatter them across 23 large DNA molecules called chromosomes; chromosome ...

Doctors in Brazil discover and confirm that a woman has blood with male chromosomes, a rare case of human chimerism.

Triploidy is a condition that affects 1% to 3% of pregnancies. It’s when a developing baby has an extra set of chromosomes, the thread-like structures that carry DNA. A triploidy pregnancy usually ...

Chromosomal abnormalities can include two basic categories: numerical or structural. A structural abnormality can include an alteration to the structure of the chromosome, as the name suggests.

Well-documented reports spanning 25 years have yielded mounting evidence that sperm counts are tumbling in industrialized countries. (See my April 20, 2017 post Going, Going, Gone? Human Sperm Counts ...

Abnormalities in the structure of chromosomes within someone’s genetic makeup are called structural chromosomal abnormalities. Robertsonian translocations are very rare structural chromosomal ...

Well-documented reports spanning 25 years have yielded mounting evidence that sperm counts are tumbling in industrialized countries. (See my April 20, 2017 post Going, Going, Gone? Human Sperm Counts ...