For these organisms to develop into functional offspring of that species, which one of the following statements must be correct? J. Specific genes in each organism are turned on and/or off to enable cells to differentiate and express species specific characteristics K. All the organisms have the same genes and it is differential gene expression that determines the characteristics that will develop. L. Individuals of different species will turn on and off the same genes and this is why embryonic development looks the same in all animals. M. Different species have different genes, however, the same messages are sent and this explains why the embryos look the same in the early stages of development.

8. Hox genes are important primarily because they regulate _________.   A. gene expression during embryonic development (e.g., affecting appendage length/location)   B. energy processing of the individual, thereby affecting fitness   C. immune system responses to Pox viruses (e.g., chicken pox)   D. lower coelom development, including internal organs   E. reproductive capacity in adulthood and therefore Darwinian fitness

Which of the following statements is an evolutionary advantage of sex and sexual reproduction?   A. Sex and recombination results in decreased genetic variation in a population and maintains advantageous traits. B. Sex and recombination can bring beneficial alleles together when producing offspring. C. Sex and recombination results in the inheritance of all the genetic information available from both parents. D. Reproduction is less risky when gametes from two individuals must fuse.

Which of the following is the best analogy for molecular genetics' view of human development? Select one: a. an energy bar Incorrect b. a buffet table c. a take-out box d. a food truck

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Direction: For each of the five examples below, give the name of the isolating mechanism and specify ifit is prezygotic or postzygotic isolation.a. In some bee population, only large bees are big enough to unfold flower petals and obtain nectarand pollen.b. A cross between two fish species occurs but development only occurs up to 16-cell stage.c. In drosophila, when sperm form one species enters the other species, the sperm is immobilized andunable to fertilized egg.d. Fireflies have a unique lighting pattern. The frequency of lighting is species specific. Fireflies in thesame area will not mate with those having a different lighting frequency.e. Two species of butterflies are found in northern Michigan, but one species is found only near riversand streams, the other near lakes.

A. Explain which force of evolution is seen here by a hybrid bird landing on an island that is not its home and breeding with the indigenous population.  B. Explain which force of evolution randomly chooses an individual from a larger gene pool to form a new, smaller population with less genetic variety.