More than two parents?

Inbreeding: When Parents Transmit More Than Genes

Inbreeding in wild populations can have devastating effects on fitness, but the genetic causes should not be transmitted across generations. A new study of song sparrows has revealed a parent-offspring resemblance for inbreeding, resulting from population structuring, with important implications for understanding the genetic causes of phenotypic variation in wild populations.

ABO and Rh Blood Type Relationship in Parents with more than One

Abstract Background Parental blood variables are one of the most important medical-biological causes of intellectual and physical-movement disabilities. The purpose of this study was to identify the relationship between parents’ blood variables (ABO and Rh blood type) and their relationship with frequency of intellectual and physical-movement disabilities in Isfahan province. Materials...

Comparing More Than Two Groups

Are children of military parents more physically fit than children of civilian parents?

BACKGROUND AND OBJECTIVES It is not known whether parental activity levels influence children's physical fitness. Members of the military are required to maintain standards of physical fitness, whereas the civilian population is not. We conducted this study to compare fitness levels of children in military and civilian families. METHODS This was a prospective cohort study of third-grade stude...

Switching with more than two colours

The operation of switching a finite graph was introduced by Seidel, in the study of strongly regular graphs. We may conveniently regard a graph as being a 2-colouring of a complete graph; then the extension to switching of an m-coloured complete graph is easy to define. However, the situation is very different. For m > 2, all m-coloured graphs lie in the same switching class. However, there are...