Test your basic knowledge |

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






2. Reciprocal evolution in two species as a result of the selection pressure each imposes upon the other






3. Term used to refer to an organism that has two identical alleles for a particular trait. e.g TT is the homozygous genotype for Tall.






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






5. Is a sequence of DNA that codes for a protein and thus determines a trait. This is because the sequence of bases code for certain proteins.






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






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






8. DNA is made of...






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






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






11. What does DNA stand for...






12. A point of overlap of paired chromatids at which fusion and exchange of genetic material (crossing over) occurs during prophase I of meiosis.






13. Selection against one end of a range of variation - resulting in a progressive change in allele frequency






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






15. The environmental factors that favour certain phenotypes






16. process in which homologous chromosomes exchange portions of their chromatids during meiosis.






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






18. Copying the code from DNA onto mRNA






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






20. Cross where you cross unknown genotype with a recessive






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






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






23. Physical characteristics of an organism based on its genotype. e.g. Plant that has a genotype of TT will have a phenotype of Tall.






24. T or F If a nucleic acid contain uracil it is DNA






25. Gradual evolution within a lineage






26. Is a base found in DNA and RNA. Cytosine pairs with Guanine in DNA






27. 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.






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






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






30. 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






31. One of the identical rods of a chromosome.






32. Selection for the ability to obtain a mate






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






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






35. How often a particular gene occurs in the population






36. Is active during transcription






37. An ancestor that two or more descendants have in common






38. Organ that serves no useful function in an organism






39. Another name for a gene






40. Any indirect evidence of life preserved as an impression in rock; trails - footprints - tracks - burrows - and bite marks






41. Process in which DNA is duplicated






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






43. The reduction of a population - typically by a natural disaster - such that the surviving population is no longer genetically representative of the original population.






44. Any preserved remains of an organism from the past. Usually found in sedimentary rock.






45. An episode of large - scale extinction affecting many different groups of organisms within a short period of time






46. A limb with five digits (fingers)






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






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






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






50. 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