Related topics: genes · genome · cells · dna · cell division

The not so inactive X chromosome

Nearly every cell in our body contains pairs of each of our chromosomes, and these pairs are identical in all but one case: that of our sex chromosomes. Males typically have one X and one Y sex chromosome, while females typically ...

Radiation damage to paternal DNA is passed on to offspring: Study

Whether radiation exposure of fathers can have consequences on their children is one of the most long-standing questions in radiation biology. Using the nematode Caenorhabditis elegans as a model, Professor Dr. Björn Schumacher ...

Study finds DNA repair declines with age, limiting fertility

Even worms have a ticking fertility clock. Older worms are less efficient at repairing broken DNA strands while making egg cells—part of a process that's essential for fertility. A new study from University of Oregon (UO) ...

Novel sex-determination mechanism revealed in mammals

In mammals, the distinction between male and female at the chromosomal level is due to the X and Y chromosomes. Typically, females have two X chromosomes (XX) while males have an X and a Y chromosome (XY). The Sry gene on ...

Evidence for new theory of genetic recombination

In most higher organisms, including humans, every cell carries two versions of each gene, which are referred to as alleles. Each parent passes on one allele to each offspring. As they are linked together on chromosomes, adjacent ...

A new way to make new species

The evolution of a new species by hybridization from two already described species without a change in chromosome number is very rare in the animal kingdom. So far, only a few accepted empirical examples exist for this spontaneous ...

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