This may be viewed as the breaking up of a large sexual population (panmictic) into smaller overlapping sexual populations. In other cases, individuals may appear similar although they are not members of the same species. Two species that occasionally mate and produce zygotes, but that have incompatible genes that prevent the resulting embryo from developing, are affected by, Two species that sometimes mate and produce vigorous but sterile offspring are affected by, Two species interbreed occasionally and produce vigorous, fertile hybrids. C) can't mate with each other, because mating occurs at different times. The morphological species concept relies upon comparing the DNA sequences of organisms, Two populations of organisms belong to the same biological species when they, Encounter each other, mate, and produce viable, fertile offspring under natural conditions. Which of the reproductive barriers separates a pair of species that could interbreed except that one mates in spring and the other in fall? The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance. I have a A Level Biology question that I just don't know how to answer. One of the key contributions of the punctuated equilibrium model is that it helps explain. However, there may be low frequencies of exchange with these neighbors. This was about 12 years after the world population reached 5 billion in 1987, and six years after the world population reached 5.5 billion in 1993. Again, the basis to any changes in a group or population of organisms must be genetic for this is the only way to share and pass on traits. Two populations of organisms belong to the same biological species when they A) have anatomical features that make it difficult for organisms from the two populations to mate with one another. A male baby is born with the sex chromosomes constitution XYY. Species’ appearance can be misleading in suggesting an ability or inability to mate. Only heritable traits can evolve. Which provides the most general and correct description of the idea of a reproductive barrier? Population Control: Real Costs, Illusory Benefits, Population and housing censuses by country, International Conference on Population and Development, Human activities with impact on the environment, Current real density based on food growing capacity, Antiviral medications for pandemic influenza, Percentage suffering from undernourishment, Health expenditure by country by type of financing, Programme for the International Assessment of Adult Competencies, Progress in International Reading Literacy Study, Trends in International Mathematics and Science Study, List of top international rankings by country, Rio Declaration on Environment and Development, Convention on Biological Diversity (1992),, Short description is different from Wikidata, Wikipedia indefinitely move-protected pages, Creative Commons Attribution-ShareAlike License, This page was last edited on 21 October 2020, at 23:10. Organisms of the same species have the highest level of DNA alignment and, therefore, share characteristics and behaviors that lead to successful reproduction. The overall rise in homozygosity is quantified by the inbreeding coefficient (f or φ). Molecules are made of atoms, the smallest unit of chemical elements. Which of the following would a biologist describe as microevolution? An organism colonizes an isolated area that is habitable but relatively devoid of life.

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