Mammals

Many tissues in mammals, e.g., liver and skeletal muscle, have endogenous clocks. But all of these are under the control (more or less, see note) of a "master clock", the suprachiasmatic nucleus (SCN) — clusters of neurons in the hypothalamus.
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Mammals developed from primitive mammal-like reptiles during the Triassic Period, some 200-245 million years ago.
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mammals: milk-producing animals.
marsupials: the mammals whose embryos develop within the mother's uterus for a short period of time before birth.
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Mammals, most other animals, and higher plants as well, have ways to minimize inbreeding. They can be mechanical or societal.
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mammals Vertebrates that have hair and mammary glands.
mammary gland The breast. In female mammals, the mammary glands produce and secrete milk to nourish developing young.
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in mammals, modification of the zona pellucida that blocks polyspermy; enzymes released by cortical granules digest sperm receptor proteins ZP2 and ZP3 so that they can no longer bind sperm.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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In mammals with more than one X chromosome, the genes on all but one X chromosome are barred from being expressed. This happens in XXY males as well as XX females. A few genes, however, have corresponding genes on the Y chromosome and are not barred.
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For mammals, 40 of 47 reconstructions were perfect - 100% accurate. In six of the remaining cases, where the method did not give a perfect prediction, it came close, accurately predicting 94-97%.
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Cloning Mammals
Cloning animals refers to producing offspring that are genetically identical to the animal being cloned.
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Like all mammals, whales breathe air into lungs, are warm-blooded (i.e., endothermic), breast-feed their young, and have some (although very little) hair.
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in female mammals, a tube leading from the uterus to the exterior; or a place where reproductive cells are stored
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
What Topic Is Your BIOLOGY Paper On?
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eutherian mammals
Placental mammals; those whose young complete their embryonic development within the uterus, joined to the mother by the placenta.
eutrophic lake ...
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Herbivorous mammals: lemmings, voles, caribou, arctic hares and squirrels
Carnivorous mammals: arctic foxes, wolves, and polar bears ...
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: Placental mammals. A subclass of the Class Mammalia (others are
monotremes
and marsupials). Embryo and fetus are nourished by a placenta.
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teat
Of female mammals, the nipple of a breast or udder, from which the young suck milk.
telson
The terminal appendage of the last abdominal segment of some arthropods.
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But in some other mammals, occasionally mitochondrial chromosomes do survive and recombine, so you do get some recombination that happens, and the question is: Does this occasionally happen in humans?
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Barr body -- the condensed single X-chromosome seen in the nuclei of somatic cells of female mammals. base pair a pair of hydrogen-bonded nitrogenous bases (one purine and one pyrimidine) that join the component strands of the DNA double helix.
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Most commonly yields lactate in mammals or ethanol in yeast. fibroblast A cell of connective tissue that secretes connective tissue proteins such as collagen. fibrous proteins Water-insoluble proteins that serve in a protective or structural role.
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Since then, our knowledge about a superfamily of similar proteins present in mammals, birds, fish, insects, plants and some protozoa has expanded, and their properties as potent peptidase inhibitors have been firmly established.
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The conclusion that might be drawn from the above is that there are many features of ancestral retinal anatomy that were retained in most classes of vertebrates, but lost in mammals. Elaborate color vision is just one such feature.
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The female reproductive cycle of most mammals (not primates). It consists of four stages: proestrus, where the uterine lining begins to thicken; estrus or the "heat" phase of sexual receptivity when ovulation occurs; metestrus, ...
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ruminant. Any of the hoofed mammals (including cattle, deer, sheep) that chew the cud.
runner. Stolon of a strawberry plant, on which a daughter plant may develop.
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MenstrualCycle cyclical sexual receptiveness in a female of some species of mammals followed by shedding of the unused endometrium
(mensa = month)
Mesophyll the middle layer of a leaf
(meso = middle; phyll = leaf) ...
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Shared derived characters that are regarded as homologous are called synapomorphies, e.g. the presence of mammary glands in all three lineages of mammals (monotremes, marsupials and placentals).
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The apoB gene encodes an apolipoprotein important in lipid transport in mammals.
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Ecogeographic rule: one of the statements from 19th century naturalists recognizing correlations between the morphology of warm blooded animals (mammals and birds) and climatic and/or latitudinal gradients.
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A strategy for making cancer cells more vulnerable to chemotherapy. One approach has been to link parts of genes expressed in cancer cells to other genes for enzymes not found in mammals that can convert a harmless substance into one that is toxic to ...
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The evolutionary development of similar external morphological traits in organisms which are unrelated (except through distant ancestors) as each adapts to a similar way of life and/or environment.
Sharks (fish), dolphins (mammals), ...
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The different tubulin isoforms seem, however, to be functionally equivalent. G-tubulin is localized in the centrosome and is involved in nucleation of microtubule assembly during the cell cycle. Highly conserved from yeast to mammals.
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