The octopus is an invertebrate animal from the phylum Mollusca (soft-bodied animals, which may or may not be protected by a shell), and within this from the class Cephalopoda. It occurs in marine environment, and has a wide distribution – it can be found in tropical and temperate regions and at different depths. The common […]

Okazaki Fragments definition Okazaki Fragments refers to small single stranded DNA fragments, formed upon DNA replication, more specifically, the back strand.   DNA Replication/Duplication For normal cell growth and division in organisms, an initial step called DNA replication is required. This process is based on semi-conservative copy of DNA in the nucleus of a growing […]

Oocyte I definition Oocyte I designates a female germline diploid cell that forms during the cycle called oogenesis. Mammalian oocytes I enter phase I of meiosis during fetal development. Oocyte I development Oocyte I develops during oogenesis, a cycle through which oogonium develop and produce ovum. This cycle begins in fetal development, where primordial germ […]

Oocyte II definition Oocyte designates a female germline diploid cell that forms during the cycle called oogenesis and derives from oogonium growth. In mammals and most species, oocyte II is a haploid cell derived from the maturation of oocyte I in oogenesis. Oocyte II development At the end of meiosis phase I, in oogenesis, oocyte […]

The osteoblast, cell found within bone tissue, is responsible for bone synthesis and mineralisation over the formation of the skeleton and further bone remodelling (…)

The osteoclast is one of the bone cells. Its function is the resorption of bone tissue over a process called remodelling (…)

Definition of ovum The ovum (or egg cell, figure 1) is the mammalian female gamete (haploid cell), produced in the ovary through a process called oogenesis. This cell is characterized by being a giant cell that contains most of the constituents necessary to give rise to a new organism. Development of the ovum At the […]

Parasitology is the branch of biology that studies parasites, their characteristics, their way of life and diseases or parasitic infections caused by them.

Discription of the pineapple fruit, its caracteristics and several uses of this fruit…

Population Genetics definition Population Genetics refers to the branch of Genetics that studies the genetic constituent of a population. It focuses specifically on hereditary alterations that occur in a population, in time and space. And tries to develop an evolutionary theory that explains and predicts such changes. Objectives of Population Genetics Population Genetics is responsible […]