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






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






3. 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.






4. Name for oism with one dominant and one recessive allele






5. Found only in that country






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






7. The movement of individuals into an area






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






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






10. 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.






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






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






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






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






15. Visual expression of a trait






16. Separates DNA by size






17. When zygote does not complete development or is physically weaker than normal






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






19. Different alleles for a gene






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






21. Another term for pure breeding






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






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






24. 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.






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






26. A change in the base sequence of a gene






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






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






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. Uses metamorphic or igneous rock - calculates the age of an object by assessing the amount of radioactive element still present in the organism. Radioactive elements are slowly lost over time because of decay.






31. Process by which an organism is slowly turned to stone as the body is replaced by minerals.






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






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






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






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






36. The gradual changes in gene frequencies in a population due to random events






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






38. Periods of rapid evolution punctuated by periods of little change






39. Situation in which allele frequencies remain constant






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






41. Process in which DNA is duplicated






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






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






44. 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.






45. DNA is made of...






46. Closely related species occupying different habitats - niches preventing them from interbreeding






47. Shows how the embryos of different groups resemble each other at particular stages. Similarities indicate groups may share a common ancestor






48. Used radioactive sulfur and radioactive phosphorus to determine that DNA is the genetic material - by demonstrating that it is DNA that is injected by bacteriophages into bacterial cells during infection






49. Determined the concept of complementary base pairing






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