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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. A type of barrier between species; the species remain isolated because male and femal gametes of the different species cannot fuse - or they die before they unite.






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






3. Trait evolves overtime; NO common ancestry






4. Term used to refer to an organism that has two different alleles for the same trait. e.g Tt is the heterozygous genotype for Tall.






5. The signal on a mRNA molecule that designates the end of the coding sequence is called the...






6. A taxon originating from and including a single common ancestor






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






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






9. What happens during the process of translation






10. One of the types of fossils made from hardened tree resin. Preserves both hard and soft parts.






11. The condition in which there is no change in allele frequencies from generation to generation (i.e. no evolution)






12. The type of environment in which an organism or group normally lives or occurs






13. Breeding organisms with specific traits in order to produce offspring with identical traits






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






15. The structure on a tRNA molecule that allows it interact with an mRNA molecule






16. Types of rocks formed after exposure to very high heat. Because of the high temperatures - fossils are not able to be recovered from these types of rocks. Absolute or radioactive dating is possible - however.






17. Genes contain instructions for assembling






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






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






20. Chromosomes that determine the sex of an individual. These are X for female and Y for male. The female egg is an X while the male sperm can be X or Y






21. Visual expression of a trait






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






23. The study of the past and present distribution of species.






24. Process by which a ribosome uses the code on mRNA to make proteins






25. Organism is preserved at very low temperatures. Preservation of both hard and soft parts can occur.






26. All the genes in a population. genes are added by reproduction and immigration and lost by death and emigration






27. The independant evolution of similar traits - starting from a similar ancestral condition






28. The complete genetic material contained in an individual






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






30. The number of times an allele appears in a population






31. Which structure contains anticodons






32. Individual that is heterozygous for two traits; shows the phenotype governed by the dominant alleles but carries the recessive alleles






33. 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






34. A combining of genes or characters different from what they were in the parents






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






36. Are noncoding sequences in the gene that are removed from RNA after transcription






37. The backbone of DNA consist of...






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






39. 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.






40. What does DNA stand for...






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






42. 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.






43. Evolution resulting from small specific genetic changes that can lead to a new subspecies






44. Different alleles for a gene






45. One of the identical rods of a chromosome.






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






47. The region of the chromosome that holds the two sister chromatids together during mitosis






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






49. Era of recent life that began about 66 million years ago and continues today; includes the first appearance Hominids






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