Cell Cycle- Definition, Phases, Regulation and Checkpoints

Cell Cycle

Cell Cycle Definition The cell cycle is the sequence of events occurring in an ordered fashion which results in cell growth and cell division. The cycle begins at the end of each nuclear division and ends with the beginning of the next. A cell cycle acts as a unit of biological time that defines the life history of the cell.  …

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Oogenesis / Ovulation / Ovarian cycle- Definition, Phages, Process

Oogenesis or Ovulation or Ovarian cycle

Oogenesis Definition Oogenesis is the female version of gametogenesis. It is the process of formation of female gamete or ovum, necessary for sexual reproduction. The process of oogenesis starts pre-natally, i.e. before the birth of the female child. It begins about 8-20 weeks after the fetus has begun to grow and goes on until the birth of the child. Thus, …

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Spermatogenesis- Definition, Stages and Process with figure


Spermatogenesis Spermatogenesis is the process of formation of mature sperm cells through a series of mitotic and meiotic divisions along with metamorphic changes in the immature sperm cell. It is the male version of gametogenesis which results in the formation of mature male gametes. In mammals, this takes place in the seminiferous tubules of the male reproductive system. Spermatogenesis requires …

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Week by week pregnancy (Baby and body development with tips)

Week-wise timeline of pregnancy (Week 1 to Week 40)

Disclaimer: The information presented on the website is for academic, study, and general information purposes only. The information and tips presented on the website must not be used for the purpose of medical advice or diagnosis or treatment. If you are not feeling well, please consult with your physician or doctor or qualified health care providers. Pregnancy is a period …

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Zebrafish Development

Zebrafish Development The teleost fish Danio rerio is commonly known as the zebrafish. It is a common small‐bodied tropical, freshwater species originally from South Asia.  The fish is a part of the Cyprinidae family, which includes carps, true minnows, barbs and related genera. The Danio genus (formerly Brachydanio) contains more than 40 related species along with the zebrafish (Danio rerio). Zebrafish as a Vertebrate …

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Implantation- Process, Events, Significance

Implantation- Process, Events, Significance The term “implantation” is used to describe the process of attachment and invasion of the uterus endometrium by the blastocyst (conceptus) in placental animals. It begins at the end of the first week and is completed by the end of the second week of gestation. Implantation occurs in the endometrium of the uterus superior in the …

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Heart Embryology- Development of the Heart

Heart Embryology- Development of the Heart The heart is a muscular organ located in the middle mediastinum that pumps blood through the circulatory system. It is one of the earliest differentiating and functioning organs in the human body. In human embryos, the heart begins to beat at about 22-23 days, with blood flow beginning in the 4th week. It begins very early …

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Developmental Biology

Developmental Biology

What is Developmental Biology? It is the field of biology that studies the processes by which multicellular organisms grow and develop, controlled by their genes.  It involves the study of mechanisms of development, differentiation, and growth in animals and plants at the molecular, cellular, genetic and evolutionary levels. It also encompasses the biology of regeneration, asexual reproduction, metamorphosis, and the growth and differentiation of stem cells in the adult …

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Stages of Childbirth

Stages of Childbirth

Stages of Childbirth Labor is a physiologic process during which the fetus, its associated membranes, the umbilical cord, and the placenta are expelled from the uterus. During most of the months of pregnancy, the uterus undergoes periodic episodes of weak and slow rhythmical contractions called Braxton Hicks contractions. Contractions become progressively stronger toward the end of pregnancy; that start stretching …

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Drosophila Development- Stages, Significance

Drosophila Development- Stages, Significance The fruit fly Drosophila melanogaster has been extensively studied for over a century as a model organism for genetic investigations. It also has many characteristics that make it an ideal organism for the study of animal development and behavior, neurobiology, and human genetic diseases and conditions. Image Source: biology.kenyon.edu Developmental Stages of Drosophila The development of Drosophila can be …

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