A seaweed may belong to one of several groups of multicellularalgae: thered algae,green algae, andbrown algae. As these three groups are not thought to have a common multicellular ancestor, the seaweeds are apolyphyleticgroup. In addition, some tuft-forming bluegreen algae (Cyanobacteria) are s...
This study examines freshman undergraduate biology majors' understanding and application of the concept of common ancestry. We used a survey that asked students to provide a brief definition of common ancestry and to rate their confidence that different pairs of organisms shared a common ancestor. ...
The biological species definition can be difficult or impossible to apply (continued) The phylogenetic species concept defines a species as the “smallest diagnosable group that contains all the descendants of a single common ancestor” Basically, each distinctive branch on a phylogenetic tree ...
Biology definition of organism: a living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis Table of Contents Anorganismrefers to aliving thingthat has an organized structure, can react to stimuli, reproduce,grow, adapt, and maintainhomeos...
reliabilityofmoleculardatescouldbequestioned/reliabilityoffossildatescould bequestioned;[3max] D2.(a)speciesareorganismsthatcansuccessfullyreproducewitheachother/existin reproductiveisolation; definitionoriginallybasedonmorphologicalfeatures; organismsthatappeardifferentareabletointerbreedsuccessfully/organismsthat appeartobe...
A glossary of mothing terms and slang in alphabetical order, for those new to mothing and veterans alike. Italicised terms generally have a definition in the glossary. This, occasionally “proboscis-in-palp”, like my tongue-in-beak birding glossary, is a work-in-progress. Please send me co...
Definition and associated terms When Carl Linnaeus introduced the rank-based system of nomenclature into biology in 1735, the highest rank was given the name "kingdom" and was followed by four other main or principal ranks: class, order, genus and species.[1] Later two further main ranks wer...
Homologous Structures Definition What are homologous structures?In biology, homologous structures are physical features found in different organisms that share a common ancestor. This similarity is due to shared ancestry between a pair of structures (i.e.homologous chromosomes) or genes in different taxa...
22.Exon definition as a potential negative force against intron losses in evolution 机译:外显子定义为对抗进化中内含子损失的潜在负力 作者:Deng-Ke Niu 期刊名称:《Biology Direct》 | 2008年第-1期 23.On the brink between extinction and persistence 机译:濒临灭绝和持久 作者:Cino Pertoldi;Lars...
Biology definition: Bacteria are microscopic, single-celled organisms belonging to Kingdom Monera that possess a prokaryotic type of cell structure, which means their cells are non-compartmentalized, and their DNA (usually circular) can be found throughout the cytoplasm rather than within a membrane...