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en.wikipedia.org/wiki/Species

In biology, a species is the basic unit of biological classification and a taxonomic rank. A species is often defined as the largest group of organisms in which two individuals can produce fertile offspring, typically by sexual reproduction. ... Thus, no matter what variations occur in the individuals or the species, if they spring from ...

www.columbia.edu/itc/barnard/biology/biobc1001/quizzes/BIOBC1001x_q7.html

If the frequency of expression of a recessive trait in a population is 16 percent, the frequency of the ... Two individuals are members of the same species if they ...

answers.yahoo.com/question/index?qid=20081028095106AAhrpHS

Members of the same species share the same characteristics and differ only in ... species concept", which states basically that two individuals will ... the characteristics that determines if organisms belong to the same species are: ... E.g., donkey and horse are not part of same species; while they can have a ...

slideplayer.com/slide/9746334

29 Two individuals are unquestionably members of the same species if they: a. possess the same number of chromosomes. b. breed at the same time. c. are ...

courses.lumenlearning.com/boundless-biology/chapter/formation-of-new-species

Members of the same species are similar both in their external appearance and their ... Mutations can occur in any cell of the body, but if a change does not occur in a ... A species is a group of individual organisms that interbreed and produce fertile ... The closer relationship two organisms share, the more DNA they have in  ...

www.biology4kids.com/files/studies_species.html

Species=Individuals. Scientists have all these complex ways of organizing living things. They look at your physical traits, how you develop as a fetus, or in an egg. ... You are the same species as another being if you can do a really important ... fern is the probably the same species if the two ferns can create a similar fern that  ...

biology.stackexchange.com/questions/45411/how-can-two-individuals-of-the-same-species-have-different-chromosome-numbers

biological species concept, a species is a group whose members can produce ... problem, they still produce fertile offspring, so they are the same species. If ... If these species produce gametes n = 6 and n =12, fusion of those ...

www.khanacademy.org/science/biology/her/tree-of-life/a/species-speciation

In this definition, members of the same species must have the potential to interbreed. ... Even if organisms of different species combine their DNA to make offspring, the ... These barriers can be split into two categories based on when they act: .... a way that it becomes impossible for individuals from the two new populations ...

www.bbc.co.uk/education/guides/zw4wjxs/revision

Individuals of the same species can reproduce to make more individuals of the same species. Two individuals belonging to different species cannot normally reproduce ... If they do, their offspring is often infertile and unable to reproduce.