Dictionary,Defintion,Meaning,What is Ammonoiod, Analogous Structures, Amniocentesis, Anmiocytes, Amphibians, Amplification, Analogous Structures

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Home >> Genetics Dictionary >> Ammonoid - Analogous structures

Your Ad Here	Ammonoid Extinct relatives of cephalopods (squid, octopi, and chamber nautiluses), these mollusks had coiled shells and are found the fossil record of the Cretaceous period. Amniocentesis A procedure used in prenatal diagnosis to obtain amniotic fluid. Amniotic fluid is withdrawn from the amniotic sac syringe after insertion of a hollow needle into the sac through the abdominal and uterine wall.
2. A procedure for prenatal diagnosis in which about one tablespoon of amniotic fluid surrounding the fetus withdrawn from the amniotic sac using a very fine needle. Genetic amniocentesis is performed at The Genetics Center. Continuous ultrasound guidance during the amniocentesis makes the 60 to 90 second procedure as safe and painless as possible. Amniocytes Cells obtained by amniocentesis. Amniotes The group of reptiles, birds, and mammals. These all develop through an embryo that is enclosed within a membrane called an amnion. The amnion surrounds the embryo with a watery substance, and is probably an adaptation for breeding on land.
Amphibians The class of vertebrates that contains the frogs, toads, newts, and salamanders. The amphibians evolved in the Devonian period (about 370 million years ago) as the first vertebrates to occupy the land. They have moist scaleless skin which is used to supplement the lungs in gas exchange. The eggs are soft and vulnerable to drying, therefore reproduction commonly occurs in water. Amphibian larvae are aquatic, and have gills for respiration; they undergo metamorphosis to the adult form. Most amphibians are found in damp environments and they occur on all continents except Antarctica Amplification An increase in the number of copies of a specific DNA fragment; can be in vivo or in vitro. See also: cloning, polymerase chain reaction. 2. In molecular biology, the production of multiple copies of a sequence of DNA.	Your Ad Here
Analogous Structures Structures in different species that look alike or perform similar functions (e.g., the wings of butterflies and the wings of birds) that have evolved convergently but do not develop from similar groups of embryological tissues, and that have not evolved from similar structures known to be shared by common ancestors. Contrast with homologous structures. Note: The recent discovery of deep genetic homologies has brought new interest, new information, and discussion to the classical concepts of analogous and homologous structures.

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