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. 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






2. 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.






3. 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.






4. Nucleotides that control which amino acids are added during protein synthesis






5. Change of an organism over time. This can be caused by changes in in habitat or need to adapt for survival.






6. A unique combination of traits that are passed down from one generation to another.






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






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






9. In the event of a sperm fertilizing an egg of another species - mechanisms that prevent result being fruitful






10. 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






11. A body cell






12. Different alleles for a gene






13. Describes the isolation of a physical barrier e.g. body of water (ocean) or mountains






14. Cross where you cross unknown genotype with a recessive






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






16. When F1 is fully fertile but F2 has low fertility (rice - cotton)






17. Movement of organisms ro of from a population






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






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






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






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






22. Is a trait that is more expressed than another trait. Is written in capital letters for Genotype. E.g Tall genotype is TT or Tt where T is the allele for tall trait and t is the trait for small. T will be expressed more.






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






24. A trait that masks the expression of another trait






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






26. Situation in which allele frequencies remain constant






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






28. Organ that serves no useful function in an organism






29. 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.






30. Chromosomes are collections of many






31. Form of reproductive isolation in which two populations reproduce at different times






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






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






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






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






36. A group of organisms of the same species occupying a given area.






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






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






39. Periods of little adaptive change






40. The environmental factors that favour certain phenotypes






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






42. Speciation preceded by a period of geographical isolation






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






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






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






46. Features that are superficially similar but have different modes of development






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






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






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






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