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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 nucleotide of RNA is made of...






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






3. Change in a DNA sequence that affects genetic information






4. Another name for a gene






5. One of the identical rods of a chromosome.






6. Separates DNA by size






7. Process in which DNA is duplicated






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






9. Different alleles for a gene






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






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






12. Because of base pairing in DNA the amount of






13. Evolution of superficial phenotypic similarity of form as a result of similar selection pressures






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






15. 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






16. Process by which a ribosome uses the code on mRNA to make proteins






17. 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.






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






19. What does DNA stand for...






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






21. 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






22. 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.






23. Chromosomes are collections of many






24. Independent segregation of genes during the formation of gametes






25. Predicts the possible outcome of a genetic cross.






26. Another term for pure breeding






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






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






29. Heteros have a phenotype tintertmediate b/t phenotypes of the 2 homoz






30. 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.






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






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






33. The preserved remains or traces of an organism that lived in the past






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






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






36. 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






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






38. 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.






39. Trait where heterozygous is a blending of two alleles






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






41. The environmental factors that favour certain phenotypes






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






43. Molecules that join together to form DNA and RNA. Monomers that make up a nucleic acid






44. Inherited feature that tends to prevent species from interbreeding with other species






45. Building block of a nucleic acid (DNA and RNA)






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






47. A change in the base sequence of a gene






48. Gradual evolution within a lineage






49. A fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found






50. A body cell