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how were the classification systems of aristotle and linnaeus similar both systems divided all living things into two major groups animals and
describe two pieces of evidence indicating that speciation does not always occur at the same ratesome species of moths on the hawaiian islands appear
if a cow develops a preference for eating white four oclock flowers and ignoring pink and red four oclock flowers what type of selection is being
why is genetic homozygosity dangerous to a nearly extinct species genetic homozygosity leaves no variation for natural selection to act onthus a new
give three examples of artificial selection include examples of both animals and plants answers will vary but could include domestic cats
what is adaptive radiationadaptive radiation happens when a new population in a new environment like an island undergoes divergent evolution until
why do vestigial structures persist in modern organisms explain the evidence that indicates that species evolve over timethe environment will not
how does biogeography contribute to an understanding of evolutionin biogeography studies same animals that seem to be closely related are adapted to
why acquired traits are not directly related to the process of evolution as acquired traits are not genetically determined they cannot be passed on
name three characteristics of mitochondria and chloroplasts that support the endosymbiotic hypothesis of eukaryotic evolutionboth organelles
what role did the appearance of the ozone layer play in the evolution of early life on earthultraviolet radiation from the sun damages dna but the
explain how early rna molecules might have been able to respond to natural selectionevery rna molecule might have competed with slightly dissimilar
does radioactive dating with isotopes of uranium and thorium provide an estimate of the starting middle or end of the period of earths formation
how did pasteurs experiment answer the objections raised by supporters of the vital force hypothesispasteurs experiment allowed air from the out-
how did pasteurs experiment vary from spallanzanis experimentinstead of sealing the flask in the experimental group after boiling pasteur used a
why doesnt gene therapy cure cystic fibrosisalthough a normal gene is introduced into a patients surface cells in the lung these cells are not the
how does a dna vaccine prevent future diseasea dna vaccine having dna from a pathogen but cannot cause disease when the vaccine is injected into a
list three important discoveries that resulted from the human genome project answers should contain three of the following only about 2 percent of
why did scientists want to map the human genome they wanted to learn the location of all the significant genes in the genome in order to learn how
list three ways that dna technology could be used to improve the lives of humans answers could include identifying human remains determining a
critical thinking why is it necessary to use the same restriction enzyme to cut two pieces of dna that are to be joined togetheras each restriction
how are radioactive probes useful in dna fingerprintingradioactive probes bind to specific fragments in a dna sample like a donor gene a probe can
explain the difference among a sex-linked trait and a sex-influenced traita sex-influenced trait is influenced by the presence of sex hormones and
briefly explain how amniocentesis and chorionic villi sampling are used in genetic screening a small sample is removed from the amniotic fluid