35 min read 
The development of a chick embryo from a freshly laid hen’s egg involves various stages and intricate processes. Let’s explore the initial stages of chick embryo development based on the provided information: The hen’s egg, when laid, is relatively large, measuring about 3cm in diameter and 5cm in length. It is considered a macrolecithal egg … Read more
19 min read 
What is Fate Map? A fate map is a diagram or representation of an egg or blastula that depicts the expected fate or destiny of each cell or region at a later stage of development. Fate maps are indispensable tools in embryological experiments as they provide researchers with valuable information about the normal developmental outcomes … Read more
33 min read 
What is Embryonic Induction? Historical Background of Embryonic Induction The historical background of embryonic induction is marked by the pioneering work of Hans Spemann, a German embryologist, and his student Hilde Mangold in the 1920s. Their extensive research on newt species, specifically Triturus cristatus and Triturus taeniatus, led to the discovery of neural induction. In … Read more
19 min read 
What is Germ layer? Fate of The germ layers 1. Ectoderm 2. Mesoderm 3. Endoderm 4. Neural crest Formation of Three Germ Layers (i) Formation of Endoderm (ii) Formation of Mesoderm (iii) Formation of Ectoderm FAQ
15 min read 
What is Extra-embryonic Membranes? Types of Extra-Embryonic Membranes During chick development, four types of extra-embryonic membranes are formed: Each of these extra-embryonic membranes is composed of two germ layers. The amnion and chorion consist of the extra-embryonic ectoderm and the somatic layer of mesoderm, collectively known as the somatopleure. On the other hand, the yolk … Read more
21 min read 
What is Implantation? Time of Implantation Site of Implantation Implantation stages Implantation is a complex process that involves a series of stages in the embryonic development of mammals. These stages are crucial for the successful attachment and invasion of the blastocyst into the uterine wall. The five recognized stages of implantation are migration and hatching, … Read more
22 min read 
What is Placenta? Definition of Placenta The placenta is a temporary organ that develops during pregnancy and connects the developing baby to the mother’s uterus. It provides oxygen, nutrients, and eliminates waste products from the baby’s blood. Types of Placenta There are several types of placenta, characterized by different factors and arrangements. Here are the … Read more
34 min read 
What is Ethology? Definition of Ethology Ethology is the scientific study of animal behavior in natural conditions, focusing on understanding behavior as an evolutionary adaptation. History of Ethology The history of ethology is a fascinating journey that has shaped our understanding of animal behavior and its evolutionary roots. Charles Darwin, renowned for his groundbreaking work … Read more
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What is Animal Behaviour? Mechanisms of Behaviour Mechanisms of behavior play a crucial role in understanding how animals respond to their environment. Here are some key mechanisms: Understanding these mechanisms helps researchers unravel the intricate ways in which behavior is shaped and regulated in animals. By studying innate behaviors, instincts, stimulus filtering, sign stimuli, and … Read more
15 min read 
What is Orientation? In animal behavior, orientation refers to the ability of an animal to determine and maintain a specific direction or position in relation to its environment. It involves the animal’s ability to perceive and respond to various stimuli, such as light, gravity, magnetic fields, landmarks, and chemical cues, in order to navigate and … Read more