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  Home >> Genetics Dictionary >> Macrophaly - Mammary Glands

Macrocephaly
A condition, either present at birth or acquired, where the head is abnormally large.

Macrorestriction Map
Map depicting the order of and distance between sites at which restriction enzymes cleave chromosomes.

Malformation
A single localized poor formation of tissue that initiates a chain of subsequent defects in the developing fetus.

Malignant
In reference to neoplasm, having the property of locally invasive and destructive growth and metastasis. Compare to benign.

Map unit
A measure of distance between two genes on a chromosome, corresponding to a crossover frequency of one per cent.

Mapping
gene mapping, linkage map, physical map

Mapping population
The group of related organisms used in constructing a genetic map.

Mandible
A part of the bony structure of a jaw. In vertebrates, it is the lower jaw; in birds, the lower bill; in arthropods, one of the paired appendages closest to the mouth.

Macroevolution
A vague term generally used to refer to evolution on a grand scale, or over long periods of time. There is no precise scientific definition for this term, but it is often used to refer to the emergence or modification of taxa at or above the genus level. The origin or adaptive radiation of a higher taxon, such as vertebrates, could be called a macroevolutionary event.

Macromutation

Mutation of large phenotypic effect, one that produces a phenotype well outside the range of variation previously existing in the population.

Malaria
A sometimes-fatal disease transferred to humans by mosquitoes, infecting the bloodstream.

Malthus, Thomas
A British economist and demographer best known for his treatise on population growth, which states that people will always threaten to outrun the food supply unless reproduction is closely monitored. His theory was in opposition to the utopians of the 18th century.

Mammals
The group (specifically, a class) of animals, descended from a common ancestor, that share the derived characters of hair or fur, mammary glands, and several distinctive features of skeletal anatomy, including a particular type of middle ear. Humans, cows, and dolphins are all mammals.

Mammary Glands
Only found in mammals, these are specialized glands that can produce milk for feeding young.

 

 

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