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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. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. e.g. Tt plant will still be tall. Where T is the dominant trait for tall and t is the recessive trait for small.






2. A geographic gradient in the extent to which a character is developed in a species






3. Actual remains of an organism such as bones - teeth - shells - etc.






4. 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.






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






6. 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






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






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






9. Change to a chromosome in which part of the chromosome is repeated






10. The movement of genes between populations as a result of mating of migration






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






12. Is active during transcription






13. A process where the organisms that have traits that aid in its survival (adaptive traits) will reproduce to pass that trait to futher generations thus increasing the frequency of that trait in the population. Vice versa traits that reduce the chance






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






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






16. 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.






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






18. A process that results in an allele having a different probability of remaining in the gene pool compared with that of another allele






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






20. A DNA strand that has the bases CTAATGT forms a complete complementary double helix with






21. Another term for pure breeding






22. Structure present in an organism however does NOT have a known function. May link organisms with similar vestigial structures. Example: appendix - coccyx bone - whale leg bones.






23. Selection for the ability to obtain a mate






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






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






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






27. 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






28. When competition causes two closely related species to become more different in regions where their ranges overlap






29. A nucleotide of RNA is made of...






30. Innate trait; shared ancestry






31. The movement of individuals into an area






32. Group of similar organisms that can breed and produce fertile offspring






33. Transfer RNA; type of RNA that carries amino acids to the ribosome






34. Mating of 2 oism that differ in 2 characters






35. Recognize and cut DNA at specific sequences usually palindromes






36. A limb with five digits (fingers)






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






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






39. Is any chromosome that is not a sex chromosome.






40. Earth's history organized into four eras: Precambrian - Paleozoic - Mesozoic - and Cenozoic






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






42. The evolutionary process by which a species becomes better suited to its niche.






43. A change in the base sequence of a gene






44. Is found in DNA






45. 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






46. 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.






47. A genetic crosses that involve one trait. e.g TT plant crossed with tt plant has offspring who are heterozygous Tt.






48. The specific location of a gene on a chromosome






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






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