A chromosome that fails to pair with another during the prophase stage of meiosis, and therefore does not exchange genetic information via crossing over. This situation usually occurs in polyploids with an odd chromosome compliment, such as triploids...
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..
Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..
Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..
