True or False 1.) Scientists only consider breeding behavior whendetermining evo

Question

True or False 1.) Scientists only consider breeding behavior whendetermining evolutionary relationships. 2.)If spiders and scorpions belong in the same class, thenthey must also belong in the same phylum. 3.)Because of taxonomy, scientists always agree on the peciesof animals. 4.)Today, scientists try to classify creautures on the basisof evolutionary realtionships. 5.)Fossil evidence indicates that humans have not undergonemany anatomical changes over the last 200,000 years. 6.)Cro-Magnons were physically almost identical tocontemporary humans. 7.)According to Hardy-Weinberg principle, the frequency ofalleles in a population tends to change even when nothingspecifically affects them. 8.)Scientists believe that all speciation takes placegradually over a very long period of time. 9.)When population is in genetic equilibrium, there is nogenetic variation among individuals in that population. True or False 1.) Scientists only consider breeding behavior whendetermining evolutionary relationships. 2.)If spiders and scorpions belong in the same class, thenthey must also belong in the same phylum. 3.)Because of taxonomy, scientists always agree on the peciesof animals. 4.)Today, scientists try to classify creautures on the basisof evolutionary realtionships. 5.)Fossil evidence indicates that humans have not undergonemany anatomical changes over the last 200,000 years. 6.)Cro-Magnons were physically almost identical tocontemporary humans. 7.)According to Hardy-Weinberg principle, the frequency ofalleles in a population tends to change even when nothingspecifically affects them. 8.)Scientists believe that all speciation takes placegradually over a very long period of time. 9.)When population is in genetic equilibrium, there is nogenetic variation among individuals in that population.

Explanation / Answer

1) This question is rather vague. Scientists consider breedingbehaviour for many reasons, including determining evolutionaryrelationships, but also in studying genomes, when studyingpopulation dynamics, studying the effects of factors such ashunger, habitat, age, etc on breeding behaviour and offspring, etcetc etc... 2) King Phillip Comes Over For Good Spaghetti. Kingdom -> Phylum -> Class -> Order -> Family ->Genus -> Species. Work your way down the line. Each phylumcontains many classes, and each class only belongs to onephylum. 3) Taxonomy does NOT help scientists to always agree onspecies. There are many paraphyletic and polyphyletic groups thatdo not include all species within the tree, or include species notof the same ancestor. Taxonomical categories are very fluid and areconstantly being changed. 4) True 5) The divergence of the modern human ancestor is said to havediverged 200,000 years ago, so most of the MAJOR anatomical changesoccured before this point. However, there have been some anatomicalchanges in humans as we have been evolving over these last 200,000years (our brains grew and we have gotten much bigger, to name two)but most major characteristics that define us as homo sapiens wouldhave evolved prior to 200,000 years ago 6) Yes, they were physically very similar. They were slightlythicker and had a larger cranium, but otherwise were verysimilar 7) No. Quite the opposite. The hardy-wienburg equation statesalleles and genotype frequencies remain in equilibrium unlessaffected by some outside factor (IE the population is very small,inbreeding, etc) 8) This is true. One individual may have a beneficial mutationthat increases its evolutionary fitness, but it will take many manygenerations for this gene to be spread throughout thespecies. 9) Genetic equilibrium means the allele frequency isn'tchanging, so if the entire population is in genetic equilibriumthat means the individual traits are at equilibrium (IE no longerevolving). However, this does not mean that there is no variationat all - it just means the levels of each variation type is notchanging.

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