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PCAT Biology Evolution

Subjects : pcat, biology
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. Genotypes with favorable variations are selected thorugh natural selection - and the frequency of favorable genes increases with the genepool. genotypes with low adaptive values tend to disappear






2. The decimal fraction representing the presence of an allele for all members of a population that have this particular gene locus






3. The sum total of all the alleles for any given trait in the population






4. All members of a particular species inhabiting a given locations






5. When the gene frequencies of a population are not changing - the gene pool is stable - and population is not evolving






6. Over many generations of natural selection - the favorable changes eventually results in such significant changes of the gene pool that we can say a new species has evolved






7. Developing population must compete for the necessities of life. many young must die - and the number of adults in the population generally remains constant from generation to generation






8. Migration of individuals between populations that will result in a loss or gain of genes - thus changing the composition of a population's gene pool






9. Formed by minerals deposited in molds






10. Population is very large -no mutations affect the gene pool -mating between individuals in the population is random -there is no net migration of individuals into or out of the populations -genes in the population are all equally successful at reprod






11. Stages of development of the embryo resemble the stages in an organism's evolutionary history






12. Refers to changes in the composition of the gene pool due to chance -tend to be more pronounced in small populations - where it is sometimes called the founder effect






13. Primitive horse the size of a fox with four toes and short teeth with pointed cusps for feeding on soft leaves






14. Impressions left by an organism ex: footprints






15. Common ancestor is found at the trunk and the modern species at the tips of the branches






16. If gene pools within a species become sufficiently different so that two individuals can't mate and produce fertile offspring - two different species have developed






17. The closer the organisms in the evolutionary scheme - the greater the similarity of their chemical constituents






18. Organisms in a species have variations that give them an advantage over other members of the species -organisms may have adaptations that are advantageous for survival






19. Hairy elephant found in the Siberian ice






20. Change allele frequencies in a population - shifting gene equilibria -can either be favorable or detrimental for the offspring






21. Change in the genetic makeup of a population with time -explained by the constant propagation of new variations in the genes of a species - some of which impart an adaptive advantage






22. Species multiplication is generally accompanied by migration to lessen intraspecific competition






23. Most organisms demonstrate the same basic needs and metabolic processes -require the same nutrients and contain similar cellular organelles and energy storage forms






24. Incude teeth - bones - etc. rock - tar pits - ice - and amber






25. The process in which minerals replace the cells of an organism






26. Individuals that survive (those with favorable variations) live to adulthood - reproduce their own kind - and thus transmit these favorable variations or adaptations to their offspring






27. Discredited theory held that new organs or changes in existing ones arose becaUse of the needs of the organism






28. Same basic anatomical features and evolutionary origins -demonstrate similar evolutionary patterns with late divergence of form due to differences in exposure to evolutioinary forces






29. Results from the geographic isolation of a population






30. When groups within the branches develop in similar ways when exposed to similar environments -ex: fish and dolphins






31. Appear to be useless but apparently had some ancestral functions






32. A cluster of colloidal molecules surrounded by a shell of water -tend to absorb and incorporate substances from the surrounding environment






33. Similar functions but may have different evolutionary origins and entirely different patterns of development






34. Dissimilar species ahve been found to have evolved from a common ancestor






35. Small local population -closely related genetically since mating between members of the same occurs more frequently =influenced by similar environmental factors and thus are subject to the same selection processes






36. Real populations have unstable gene pools and migrating populations -agents of this change are natural selection - mutation - assortive mating -genetic drift - and gene flow






37. Primitive crustacean (relative to the lobster) - which was dominant form of the early Paleozoic era






38. Ancient animals similar to both reptiles and birds and dominant in the Mesozoic era






39. P^2+2pq+q^2=1 -p^2=frequency of TT (dominant homozygotes) -2pq=frequency of Tt (heterozygotes) -q^2=frequency of tt (recessive homozygotes)






40. More offspring are produced than can survive






41. Mates are not randoomly chosen but rather selected according to criteria such as phenotype and proximity - the relative genotype ratios will be affected and will depart from the predictions of the Hardy-Weinberg equilibrium






42. Stanley L. Miller demonstrated the application of UV rays - heat or a combination of these to a mixture of methane - hydrogen - ammonia - and water could result in the formation of complex molecules -after circulation of the gases for one week - he a






43. The most direct evidence of evolutionary change -represent the remains of an extinct ancestor -generally found in sedimentary rocks






44. Primitive heterotrophs slowly evolved complex biochemical pathways which enabled them to use a wider variety of nutrients -evolved anaerobic respiratory process to convert nutrients into energy -photosynthesis and autotrophic nutrition was developed






45. Pressures in the environment select for the organism most fit to survive and reproduce -concluded that a member of a particular species that is equipped with beneficial traits - allowing it to cope effectively with the immediate environment - will pr


46. First forms of life lacked the ability to synthesize their own nutrients; they required performed molecules which made them heterotrophs -energy was present in the form of heat - electricity - solar radiation - including x rays and ultraviolet light






47. Populations will become sufficiently different from each other to be able to reproduce






48. The evolution of new species - which are groups of individuals who can interbreed freely with each other but not with members of other speies






49. Missing link between reptiles (has teeth and scales) and birds (also has feathers)






50. Colloidal protein molecules tend to clump together to form coacervate Droplets