Search Results for: fertility
Demographic transition
The demographic transition model is a theoretical framework that explains the historical shift in population dynamics as a... Read More
Y chromosome
Y chromosome Definition The Y chromosome constitutes one member of the pair of sex chromosomes within an organism, a common... Read More
Biological clock
Definition noun, plural: biological clocks Any of the various mechanisms that regulate biological rhythms Supplement A... Read More
Reproductive system
What is the Reproductive System? The reproductive system of an organism is the biological system made up of all the... Read More
Sex factor
Definition noun A DNA sequence or plasmid that confers certain bacteria the ability to produce a sex pilus for conjugation... Read More
Human Reproduction and Fertilization
For the human species to continue surviving, it is essential that mature adults are capable of producing fertile offspring... Read More
Chromatids
Chromatid Definition Chromatids are found inside our cells. Chromatids are condensed chromosomes distinguishable during... Read More
Pre-ejaculate
Definition noun The clear colorless fluid emitted from the urethra of an aroused penis prior to ejaculation Supplement In... Read More
Inbreeding depression
Definition noun, plural: inbreeding depressions The loss of vigour or the reduced biological fitness in a particular... Read More
F-positive bacterium
Definition noun, plural: F+ bacteria A bacterium with F factor existing as a plasmid and not integrated in the bacterial... Read More
Birth Control and Contraception
Birth Control Some religious beliefs see methods of contraception unethical while some political bodies chose birth control... Read More
Prophase I
Organisms all use mitosis to create more cells in the body. Meiosis, a similar process, is used in some organisms to undergo... Read More
Darwinian fitness
Darwinian Fitness Definition Darwinian fitness refers to the measure of an individual organism's or genotype's reproductive... Read More
Ecological succession
Definition noun (ecology) The progressive succession of a community or group of species in an ecosystem over... Read More
Chromosomal mutation
Every living thing is made up of DNA. Our DNA is what makes us unique and different in the world. Our DNA is made up of... Read More
Spermiogenesis
Spermiogenesis Definition Spermiogenesis is the stage of spermatogenesis wherein the spermatids differentiate into mature... Read More
Decomposer
Decomposer Definition The organisms that carry out the process of decay or breakdown of the dead organism are known as... Read More
Pollen Grain
What are Pollen Grains? Plants are unique structures and so they carry out mechanisms in special ways. Fertilization in... Read More
Sexual selection
What is Sexual Selection? The definition of sexual selection is very interesting in biological terms. The sexual selection... Read More
Natural selection
Natural Selection Definition What is natural selection in biology? Natural selection is defined as a process in nature... Read More
Conjugation
Conjugation generally means the joining or coming together (union), such as in certain unicellular organisms (some bacteria,... Read More
Inbreeding
Inbreeding is a type of breeding or mating where closely related individuals with a common ancestor produce progenies with... Read More
Metabolism
Metabolism Definition What is metabolism in the body? Metabolism encompasses the various biochemical processes, reactions,... Read More
Predisposing factors
All organisms can be born with or develop a disease at any point in their lifetime. When someone is born with a disease, it... Read More
