Egg

egg
ovum; the mature female sex cell of an animal or plant
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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5 kg ostrich egg contains the largest existing single cell currently known, though the extinct Aepyornis and some dinosaurs had larger eggs. The bee hummingbird produces the smallest known bird egg, which weighs half of a gram.
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egg -- (1) A large gamete without flagellae that is fertilized by a sperm cell. An egg cell is also called an ovum. (2) A complex multicellular structure in which an animal embryo develops.
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egg: the haploid cell within the female ovary.
elements: the fundamental building blocks of matter within all living things.
embryo: forms when all the organs of the body have taken shape.
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Egg formation takes place in the ovaries.
In contrast to males, the initial steps in egg production occur prior to birth. Diploid stem cells called oogonia divide by mitosis to produce more oogonia and primary oocytes.
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egg
A female gamete, which usually contains abundant cytoplasm and yolk; nonmotile and often larger than a male gamete.
ejaculatory duct ...
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egg The middle of three haploid cells at the micropylar end of the embryo sac; when fertilized, it will form the zygote.
egg apparatus Egg cell and adjacent synergids in the embryo sac (female gametophyte) of angiosperms.
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mictic egg
A thin shelled haploid egg. If not fertilized, they will produce males by parthenogenesis. If fertilized, they will accumulate a large amount of yolk and secrete a heavier, resistant shell.
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Chicken egg white cystatin was first described in the late 1960s. Since then, our knowledge about a superfamily of similar proteins present in mammals, birds, fish, insects, plants and some protozoa has expanded, ...
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amniote egg An egg with compartmentalized sacs (a liquid-filled sac in which the embryo develops, a food sac, and a waste sac) that allowed vertebrates to reproduce on land.
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As that egg develops into a fetus and grows into an animal, we know that the animal being born will be transgenic, ...
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storage (egg whites of birds, reptiles; seeds)
transport (hemoglobin)
contractile (muscle) ...
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merogones - egg fragments (in sea urchins) that can divide and develop, even if they have only a haploid nucleus.
mesenchyme - mesodermal cells in a developing embryo with the ability to move freely and individually.
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[Gr. oon - an egg; Gr. kytos - a hollow vessel, modern usage: cyt- denotes a cell]. A female germ cell that must undergo two meiotic divisions to become a mature ovum.
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If a mother's egg splits before fertilization, and then both go on to be fertilized, it can result in semi-identical twins, who would be identical on their mother's side but fraternal on the father's side.
Complications of twin pregnancy ...
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Ovipositor: The egg-laying apparatus of a female insect.
Palp (palpus): Sensory organ attached to insect mouthparts that is used to test the quality of food.
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ovulum - egg]. Mature female gamete or egg cell.
P
pachytene [Gr. pachytes - thickness; Gr. tainia - ribbon]. The third stage in prophase 1 of meiosis in which there is further shortening and thickening of the bivalents.
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Human: A fertilized egg that has begun cell division, often called a pre-embryo (for pre-implantation embryo). An embryo is now defined as a later stage, i.e. at the completion of" the pre-embryonic stage, which is considered to end at about day 14.
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When a sperm and an egg join together, they combine their half sets to make a unique, new set of 46 chromosomes.
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A haploid sex cell, egg or sperm, that contains a single copy of each chromosome. GEM. A genetically engineered microorganism. Gene. A locus on a chromosome that encodes a specific protein or several related proteins.
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Germ cell -- a sex cell or gamete (egg or spermatozoan).Haldane equation Haldane's law: the generalization that if first generation hybrids are produced between two species, but one sex is absent, rare, or sterile, that sex is the heterogamic sex.
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gametes Reproductive cells (sperm or egg) which are haploid. gangliosides Sphingolipids containing complex oligosaccharides as head groups.
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At about the same time, it was also discovered that during the formation of egg and sperm cells, a cell division occurs without prior doubling of the number of chromosomes.
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In an incompatible cross, the egg and sperm nuclei fail to unite during fertilization. The egg dies during embryogenesis. In some of these strains, Yen and Barr (1971) found substantial numbers of Rickettsia-like microbes in adults, eggs and embryos.
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The notion that "all life [is] from [an] egg" (from the Latin "Omne vivum ex ovo") is a foundational concept of modern biology, it means that there has been an unbroken continuity of life from the initial origin of life to the present time.
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Drosophila melanogaster egg
"The female fruit fly lays batches of between 15 and 20 white eggs each day.
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The nucleus of a sperm or an egg prior to fertilization. Sperm and egg cells carry half the number of chromosomes of other nonreproductive cells.
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STREPTAVIDIN - A bacterial analog of egg white avidin.
STRINGENCY - The conditions employed for hybridization which determine the specificity of the annealing reaction between two single-stranded nucleic acid molecules.
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Streptavidin: A bacterial analog of egg white avidin.
Stringency: A term used to describe the conditions of hybridization.
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A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells of animals and in the egg and pollen cells of plants (Gk. haploos, single). Human beings have 23 chromosomes in their reproductive cells.
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Lecithin a phospholipid found in egg yolk (used as an emulsifying agent)
(lecithos = egg yolk)
AntonvanLeeuwenhoek person who lived in the 1600s and was the first person to see sperm cells in which he thought he could see a homunculus ...
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Haploid: A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells o f animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their sex cells. Compare to diploid.
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chorion. The outer membrane of an insect egg.
circulative virus. A virus that systemically infects its insect vector and usually is transmitted for the remainder of the vector's life; persistent virus.
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Definition: The development of an unfertilized egg into an individual. This type of reproduction occurs most commonly in wasps, bees, ants, and some arthropods.
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Illustrate outcome of meiosis (egg and sperm.)
Understand relationship
between chromosomes, ...
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Lecithotrophic larva. A planktonic-dispersing larva that lives off yolk supplied via the egg
Leeward. The side of an island opposite from the one facing a persistent wind ...
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: Sexual reproduction in which one sex produces sex cells much larger (egg) than those of the other (sperm).
Antagonistic pleiotropy ...
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