In Mendelian inheritance patterns, you receive one version of a gene, called an allele, from each parent. These alleles can be dominant or recessive. Non-Mendelian genetics don’t completely follow ...

Although scientists have long known that Down syndrome is caused by the presence of an extra copy of chromosome 21, symptoms can manifest in different ways in individuals with Down syndrome. Some ...

Down syndrome is a genetic condition arising from the presence of an extra copy of chromosome 21. This chromosomal imbalance results in a characteristic constellation of physical, neurological and ...

How does the CRISPR Down Syndrome breakthrough work to remove the extra chromosome 21? We are closer than ever to a world where a genetic condition affecting one in every 700 babies could be addressed ...

Scientists have long known that the DNA code in genes is not the only way to pass genetic traits from parents to offspring. "Epigenetic" marks—chemical modifications to DNA that don't change the DNA ...