Environmental bio

123456789101112131415161718192021
Across
  1. 1. features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature
  2. 3. when species are reproductively isolated from others due to differences in behavior
  3. 4. the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers
  4. 7. among sexual organisms in which the differences in the timing of critical reproductive events
  5. 8. the process in which two or more populations of an ancestral species accumulate independent genetic changes
  6. 9. the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA
  7. 12. features of an organism that are considered to have lost much or all of their original function through evolution
  8. 14. how a new kind of plant or animal species is created
  9. 15. a physical incompatibility between reproductive organs of 2 organisms
  10. 16. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth
  11. 17. an organism's ability to pass its genetic material to its offspring
  12. 18. similar physical features in organisms that share a common ancestor, but the features serve completely different functions
  13. 19. an evolutionary process in which humans consciously select for or against particular features in organisms
  14. 20. the separation of one Group of organisms from each other
Down
  1. 2. organisms best adjusted to their environment are the most successful in surviving and reproducing
  2. 5. the physical separation of populations of organisms from one another due to geographical barriers
  3. 6. variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce
  4. 10. the process through species adapt to their environment
  5. 11. a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring
  6. 13. the complete disappearance of a species from earth
  7. 21. a change or the process of change by which an organism or species becomes better suited to its environment