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CSET Genetics And Evolution

Subjects : cset, science, genetics
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. When competition causes two closely related species to become more different in regions where their ranges overlap






2. A change in the base sequence of DNA; the ultimate source of new alleles






3. Three dimensional shape of organism made from a mold. May be created with plaster or over time with minerals.






4. The gradual changes in gene frequencies in a population due to random events






5. Type of sympatric speciation that occurs when a new species is formed because of a change in microhabitats






6. Uses metamorphic or igneous rock - calculates the age of an object by assessing the amount of radioactive element still present in the organism. Radioactive elements are slowly lost over time because of decay.






7. A trait that masks the expression of another trait






8. Heteros have a phenotype tintertmediate b/t phenotypes of the 2 homoz






9. Evolutionary process in which a species or related species folllow different evolutionary paths to eventually become less related






10. Separation of species or populations so that they cannot interbreed and produce fertile offspring






11. A model for the evolution of different froms over a long period of time but with only slight chchanges occring between successive generations






12. Determined the concept of complementary base pairing






13. Ribosomal RNA; type of RNA that makes up part of the ribosome






14. Is a base found in DNA and RNA. In DNA its partner is Thymine. In RNA its partner is Uracil






15. How many codons are needed to specify three amino acids






16. The comparison of the structures of different organisms






17. A group of organisms whose members are sufficiently alike to be able to reproduce and produce fertile offspring and who are unable to reproduce with other such groups






18. An organism that has characteristics resulting from chromosomal alteration. This is a result of crossing over of the chromosomes during Meiosis - mutations and random segregation.






19. Structures in different but related species that are derived from the same ancestral structure but now serve different purposes.






20. Similar DNA sequences or protein structures (such as hemoglobin) may link different species to a similar ancestor.






21. Dna moves during electrophoresis because of...






22. Even if the gametes of the two species meet - fertilization does not occur






23. Natural disaster eliminates most of the population - members left contribute the alleles for the new population.






24. Change in allele frequencies as a result of the migration of a small subgroup of a population






25. A nucleotide of RNA is made of...






26. Because of base pairing in DNA the amount of






27. Large - scale evolutionary changes that take place over long periods of time






28. Used x ray cyrstallography to create an image of DNA






29. These prevent fertilization between species e.g. diff breeding season - mating behaviour






30. How often a form of a gene appears in a gene pool






31. A distinct population of a species that varies from other populations of the same species.






32. Speciation preceded by a period of geographical isolation






33. Building block of a nucleic acid (DNA and RNA)






34. Transcrition occurs in the...






35. 2 alleles for a character separate during the formation of gametes - so that each gamete only carriers one allele for each character

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36. During transcription an RNA molecule is formed






37. Describes the existence of a prezygotic reproductive barrier between two species as a result of them occupying or breeding in different habitats within the same general geographical area






38. When chromosome is changed by radiation and chemicals - results a permanent structural change in the chromosome - which will no longer be able to pair with its homologous pair. Eg - deletion - duplication - inversion and translocation.






39. Form of reproductive isolation in which tere are differences in species courtship behavior






40. T or F A cloned organism has the same proteins as another organism






41. A mutation in which one nucleotide is replaced by another nucleotide






42. Type of rock made from small pieces of other rocks and organisms pressed together. Source of fossil preservation. Limited radioactive or absolute dating potential.






43. The capacity of an individual of certain genotype to reproduce. It is usually equal to the proportion of the individual's genes in all the genes of the next generation






44. Process in which DNA is duplicated






45. shape of a DNA molecule formed when two twisted DNA strands are coiled into a springlike structure and held together by hydrogen bonds between the bases.






46. Group of individuals of the same species that live in the same area






47. Periods of rapid evolution punctuated by periods of little change






48. Periods of little adaptive change






49. Organ no longer serves a function






50. Two alternative forms of a gene e.g Tall vs Short