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 produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..
Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..
The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..