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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 DNA double helix is held together in the center by between nitrogenous bases






2. Cell division that produces reproductive cells or gamates.This occurs in the gonads (testicle and ovaries in animals) Here the chromosome number is halved the original amount. (each new cell has a haploid number = n) All daughter cells are not geneti






3. 2 alleles for a character separate during the formation of gametes - so that each gamete only carriers one allele for each character


4. Predicts the possible outcome of a genetic cross.






5. 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.






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






7. Relatively rapid proliferation from an ancestral type into new types which fill a diversity of ecological niches






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






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






10. Another term for pure breeding






11. Mutation where an extra base is added






12. Gradual evolution within a lineage






13. 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.






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






15. 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.






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






17. The environmental factors that favour certain phenotypes






18. It means chromosomes are paired. One of each chromosome in a pair originates from the father and one from the mother. They affect the same trait - but don't necessarily cause the same expression of the trait.






19. Any agent that can cause a change in DNA






20. Condition in which an organism has extra sets of chromosomes






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






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






23. The complete genetic material contained in an individual






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






25. 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






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






27. The movement of individuals into an area






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






29. Describes a cell - nucleus - or organism that has only one set of unpaired chromosomes






30. Building block of a protein






31. Organ that serves no useful function in an organism






32. A pairing where the parent plants differ in only one character.






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






34. The evolutionary history/geneology of a group of organisms (a tree thingy)






35. Genes contain instructions for assembling






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






37. DNA that is coiled around proteins






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






39. 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.






40. Of a cell or organism having two sets of homologous chromosomes or twice the haploid number






41. Which structure contains anticodons






42. Hybrid is sterile so biologically unfit






43. Translation occurs in the...






44. Messenger RNA; type of RNA that carries instructions from DNA in the nucleus to the ribosome






45. Separates DNA by size






46. Process in which DNA is duplicated






47. Threadlike structure within the nucleus containing the genetic information that is passed from one generation of cells to the next






48. The enzyme that binds to the promoter region of a gene during transcription is called...






49. Movement of organisms ro of from a population






50. Cross where you cross unknown genotype with a recessive