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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. Geologic period that followed the Precambrian;means 'ancient life' - early life (570-286 million years ago); single cell organisms - shells - mollusks - rise of first vertebrates - rise of land plants - amphibians - insects - seed plants - and trees






2. A base found in DNA (but not in RNA). This base pairs with Adenine.






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






4. What is one benefit for having two strands of DNA?






5. A type of natural selection in which genetic diversity decreases as the population stabilises on a particular trait value






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






7. Periods of little adaptive change






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






9. Trait evolves overtime; NO common ancestry






10. The molecules responsible for bringing amino acids to the ribosome during protein synthesis are






11. Selection acting against the middle of a range of variation






12. The study of the structures of different organisms - looking at homologous parts






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






14. Organisms with similar functions - but different underlying structure. Example: bird and insect wing. These structures do NOT show a common ancestral link.






15. Movement of alleles into or out of a population due to the migration of individuals to or from the population






16. A trait that masks the expression of another trait






17. A copy of a gene is made during a process called this






18. Natural selection that causes the frequency of a particular allele to move in one direction






19. Is active during transcription






20. An equilibrium in the occurence of two or more different froms within the same population usually caused by different allele combiinations of a gene






21. Disappearance of a species from all parts of its geographical range






22. Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest






23. What happens during the process of translation






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






25. A type of protein molecule found in the chromosomes of eukaryotic cells but not prokaryotic cells






26. The formation of new species as a result of evolution






27. Messenger RNA; type of RNA that carries instructions from DNA in the nucleus to the ribosome






28. Copying the code from DNA onto mRNA






29. A population partially isolated from other populations of the same species






30. Identical alleles for a gene






31. Is the evolutionary process whereby a population becomes better suited to its habitat






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






33. Features of different species tat are similar in function but not necessarily in structure and in which the similarity is not the result of common ancestry






34. Independent segregation of genes during the formation of gametes






35. Deoxyribonucleic acid carries the genetic code for the proper functioning of an organism. It is composed of 5 carbon sugar (deoxyribose) four bases Adenine - Thymine - Cytosine and Guanine. the sugar is bonded to a phosphate group. This forms a long






36. Embryos of similar organisms have very similar early development indicating similar DNA at work






37. Change to a chromosome in which a fragment of the chromosome is removed






38. Layers of compressed sedimentary rock demonstrate the order or sequence at which events occurred. Cannot delineate the exact point of time - but is able to distinguish the order of events.






39. Process in which DNA is duplicated






40. Is the genetic makeup of an organism (TT or Tt) ; All the combinations of genes you have for a certain trait.






41. A nucleotide of RNA is made of...






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






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






44. Mating of an individual of unknown genotype but dominant phenotype w/ a homozygous recessive individual






45. Similar embryological structures in different species - such as gill slits - may demonstrate that these species share a common ancestor.






46. A change in the base sequence of a gene






47. Consists of all genes - including all the different alleles - that are present in a population






48. 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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49. Threadlike structure within the nucleus containing the genetic information that is passed from one generation of cells to the next






50. Form of reproductive isolation in which structural differences in the anatomy of reproductive organs prevent sperm transfer between individuals of different species