The stage of Prophase I during which the two sister chromatids of each chromosome separate from each other. Crossing-over: Non-sister chromatids remain in contact throughout pachytene and a kind of localized breakage of the DNA occurs, which is followed by exchanges of DNA between them. Crossing over produces "cross-over chromatids," each composed of distinct blocks of DNA, some blocks derived from the mother, others from the father. A mammal belonging to the erstwhile taxonomic group Pachydermata (meaning "thick skinned ones"). A formerly existing continent, now broken up or fused with other continents due to the effects of rifting and continental drift. The Paleolithic was the first period of stone tool use.
GEOLOGIC TIME SCALE paleocontinent /PALE-ee-ō-KAWN-tə-nent, -nənt/ n.
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Of two populations: Occupying different, non-overlapping, but contiguous geographic regions. Total loss of function in a muscle or set of muscles — paralyzed /PAIR-ə-līzd/ adj. An organism that absorbs nutrients on an ongoing basis from some other living organism.
A form of symbiosis in which one of the two participants benefits at the expense of the other. A parasite that kills, significantly damages, sterilizes, or even consumes its host.
(1) a stalk supporting a flower or an inflorescence; (2) a narrow appendage supporting a sessile animal and connecting it with the substrate; (3) any narrow, connecting band or stalk. It is actually composed of separate bones — the coccyx, the sacrum, and the innominate bones, which are joined together by ligaments.
MORE ABOUT ARACHNID ANATOMY peduncle /peh-DƏNK-əl, PEE-dənk-əl/ n. They are classified as eukaryotes because he have membrane bounded nuclei, but they lack all other organelles characteristic of eukaryotes (Golgi bodies, endoplasmic reticula), mitochondria, chromosomes, and centrioles. In general, the pelvic opening is larger in females than in males. The complex bony structure that in everyday parlance is called the hip bone. When it is incomplete the genotype is expressed in only part of the population.
Its thicker end (the "head") is attached to the duodenum.