- Which of the following is an example of directional selection?a mouse population that is originally white in color becoming darker in color after several generationsa moth population that is originally grey gradually dividing into discrete white and black populations over several generationsa flower population that originally ranges from white to red becoming mostly pink over several generations
- An unrooted phylogenetic tree ________.shows relationships but not lineage between species.does not show relationships between specieshas a single lineage at the base
- The ability of an individual to contribute to the gene pool of the next generation is an organism's ________ fitness.absoluterelativeevolutionary
- A(n) ________ phylogenetic tree has a single lineage at the base.branchedrootedunrooted
- One of the foundational concepts of natural selection was an essay on ________.geological time scalesthe Black Plague and ratshuman economic pressures
- Phylogenetic trees ________.show the evolutionary connections among organismsconfirm working hypotheses about species relationshipsidentify specific changes leading to new species
- Fossil evidence allows scientists to determine ________.when an organism diedwhen organisms lived relative to each otherexactly when an organism lived
- Changes in ________ are at the core of how evolution occurs.
- A mouse population that originally ranges from white to black becoming mostly grey over several generations is an example of what type of selection?
- If two species share a trait—such as birds' and bats' wings—they ________.are always evolutionarily connected.may have arisen under similar conditions without being related.may have evolved from different evolutionary conditions.
- Phylogenetic trees are usually based on ________ evidence.genetic and morphologicalgeological and biologicalgenetic and chemical
- What is the most specific taxonomic category?speciesdomaingenus
- An organism's evolutionary fitness is defined as the ability of an individual to ________.
- ________ show the evolutionary connections among organisms.
- ________ evidence allows scientists to study the progression of evolution over millions of years.
- Natural selection is limited because it works at the ________ level.allelepopulationindividual
- Before using any chemical in the lab, why should one first read the Material Safety Data Sheet (MSDS)?A.The MSDS provides information on safe handling of the chemical.B.The MSDS explains where the chemical can be purchased.C.The MSDS provides the chemical formula for the substance.D.The MSDS describes how the chemical will react with other substances.
- 7) Which one of the following hormones exerts its primary effects on the reproductive organs: A) prolactin B) adrenocorticotropic hormone C) thyroid-stimulating hormone D) follicle-stimulating hormone E) growth hormone
- Which element is considered the most versatile element in living organisms and why?A.hydrogen, because it provides most of the mass of human bodiesB.hydrogen, because it can be found in both organic and inorganic moleculesC.carbon, because it can bond with many elements to form complex molecules
- In order for natural selection to work, ________ must already be present in a population.