Identical twins almost always have the same sex, but can have different genders as they grow. In very rare cases, identical twins can be born with different sexes due to genetic mutations. Fraternal ...

For a few days every summer, a quaint town in Northeast Ohio turns into a living laboratory. This year, hundreds of people waited in hourslong lines to meet with researchers. Inside the tents, they ...

Add Yahoo as a preferred source to see more of our stories on Google. A mother of identical twins has had enough of hearing the same comment—so she decided to clear things up once and for all. After ...

Plant growth varies significantly due to differing home environments. Light exposure and watering frequency are key factors ...

Behavioral and physical differences between identical twins are fascinating because they are unexpected. Many people assume that when identical twins differ they do so because they are treated ...

Metastable epialleles may sound like complex science, but they help explain why identical animals can still look and act differently. For years, scientists asked why two mice with identical DNA could ...

Source: Photo by Alexander Grey on Unsplash. A growing amount of research suggests that sexual orientation has a genetic basis. If sexuality is genetically determined, this means identical twins ...

BOSTON -- A new study helps explain why identical twins aren't always so identical. Researchers at Washington State University studied identical twins and found that the more physically active ...