78 results found

Search Results for: ovum

Gamete

Definition of Gamete What is a gamete? A gamete is the mature reproductive or sex cell that contains a haploid number of... Read More

Ovum

Definition noun, plural: ova (1) Female gamete; female sex cell; female reproductive cell. (2) Egg cell. Supplement In... Read More

Mitochondrial DNA not just from moms but also from dads?

If one wants to trace down lineage, that person could turn to the cell's powerhouse, the mitochondrion. This organelle... Read More

Mitochondrial DNA

Mitochondrial DNA Definition noun plural: mitochondrial DNAs The genetic material in the mitochondrion that carries code... Read More

Maternal inheritance

Definition noun A form of inheritance wherein the traits of the offspring are maternal in origin due to the expression... Read More

Sexual reproduction

Sexual reproduction is a mode of reproduction involving the fusion of haploid female gamete (egg cell) and haploid male... Read More

Spermatogenesis

Spermatogenesis is the biological process of producing mature sperm cells, and occurs in the male gonad of a sexually... Read More

Allogamy

Definition noun (botany) Cross-fertilization, where fertilization occurs when an ovum of a flower is fertilized by the... Read More

Egg cell

Definition noun, plural: egg cells (1) Female gamete; female sex cell; female reproductive cell. (2) Unfertilized ovum,... Read More

Cytoplasm

Cytoplasm Definition The cell is known as the building block of all life. Blocks are made up of numerous particles and... Read More

Polyspermy

Definition noun The fertilization of an ovum by more than one sperm. Supplement The ovum fertilized by more than one sperm... Read More

Polar body

Definition noun, plural: polar bodies The cell that results from the asymmetric division of an oocyte. Supplement In animals... Read More

Parthenogenesis

To reproduce, by definition, means to produce new offspring. The process is referred to as reproduction, which is one of the... Read More

Ovarian cycle

Definition noun The cycle that depicts the changes in the ovarian follicle happening during a menstrual cycle, and is... Read More

Egg

Definition noun, plural: eggs (1) An organic vessel where an embryo develops, and one in which the female of an animal... 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

Corpus luteum

Corpus luteum (Science: gynaecology) a yellow glandular mass in the ovary formed by an ovarian follicle that has matured and... Read More

Monospermy

Definition noun The fertilization of an ovum by only one sperm. Supplement The ovum when fertilized by a sperm forms a... Read More

Secondary oocyte

Definition noun, plural: secondary oocytes The resulting oocyte when meiosis I is completed, and gives rise to ootid and... Read More

Spermiogenesis

Spermiogenesis Definition Spermiogenesis is the stage of spermatogenesis wherein the spermatids differentiate into mature... Read More

Mitochondrion

Mitochondrion Definition What are mitochondria? The term “mitochondrion” comes from the two words of the Greek... Read More

Asexual reproduction

Asexual Reproduction Definition What is asexual reproduction? Asexual reproduction is a mode of reproduction that does not... Read More

Automixis

Definition noun (botany) Self-fertilization; a mode of fertilization where fertilization takes place on the flower itself,... Read More

Dictyate

Definition noun A resting phase in mammalian oogenesis wherein the developing oocyte is arrested in prophase I of meiosis... Read More

Fertilization membrane

Definition noun The membrane that forms on the inner surface of the vitelline membrane of the ovum after the entry of a... Read More

Human Reproduction

Terminology and Concepts Primary reproductive organs are called gonads - testes in the male and ovaries in the female.... Read More

Ovocyte

Definition noun, plural: ovocytes (1) A female gametocyte. (2) A developing female germ cell or gamete. Supplement An... Read More

Developmental Biology

For the human species to continue surviving, it is essential that mature adults are capable of producing fertile offspring,... Read More

Meiosis

What is Meiosis? A simple definition of meiosis would be is this: meiosis is the process of cell division that results in... Read More

Pronucleus

pronucleus (Science: molecular biology) haploid nucleus resulting from meiosis. In animals the female pronucleus is the... Read More

Zygote

Zygote Definition What is a zygote? A zygote is a fertilized eukaryotic cell. In biology, medical science, and other allied... Read More

Diploid

Diploid Definition Let's first understand the meaning of the word - diploid. From the words ‘di’, meaning "two", and... Read More

Fimbria

Definition noun, plural: fimbriae (1) (microbiology) A short, filamentous projection on a bacterial cell, used not for... Read More

Cleavage

Definition noun (1) A division or separation of form. (2) (cell biology) The act or state of splitting or dividing of a... Read More

Germinal

Germinal Pertaining or belonging to a germ; as, the germinal vesicle. (Science: biology) germinal layers, the nucleus of the... Read More

Mole

Definition noun, plural: moles (chemistry) (1) The SI unit of amount of substance of a chemical system that contains as many... Read More

Spermatozoon

Definition noun, plural: spermatozoa A mature male gamete or reproductive cell; sperm cell. Supplement A single sperm cell... Read More

Sperm cell

Definition noun, plural: sperm cells A mature male gamete or reproductive cell; spermatozoon. Supplement A single sperm cell... Read More

Deoxyribonucleic acid

Deoxyribonucleic Acid (DNA) Definition A nucleic acid refers to any of the group of complex compounds made up of linear... Read More

Fertilization

Definition noun, plural: fertilizations (biology) (1) A process in sexual reproduction that involves the union of male... Read More