107 Final Study Guide Graded A+

Thirty people are selected for a long-term mission to colonize a planet many light-years away from Earth. The mission is successful, and the population rapidly grows to several hundred individuals. However, certain genetic diseases are unusually common in this group, and the group's gene pool is quite different from that of the Earth population they have left behind. Which of the following phenomena has left its mark on this population? {Ans: founder effect}Broccoli, cabbages, and Brussels sprouts all descend from the same wild mustard and can still interbreed. These varieties were produced by {Ans: artificial selection.}Microscopic reproductive cells produced by most fungi are {Ans: spores}Which of the following characteristics tends to limit bryophytes and seedless vascular plants to habitats that are relatively moist? {Ans: presence of flagellated sperm}Sex-linked conditions are more common in men than in women because {Ans: men need to inherit only one copy of the recessive allele for the condition to be fully expressed.}Which of the following types of reproductive barriers separates two species of corals whose sperm and egg cells often bump into each other but do not fertilize because of incompatible proteins on their surfaces? {Ans: gametic isolation}Rod-shaped bacteria