Reproductive isolation Knowledge-Based Download PDF

Questions

1. 1.

   In two closely related species of land snails, anatomical differences resulting from opposite directions of shell coiling prevent their reproductive openings from aligning during attempted mating. Which type of reproductive isolating mechanism is operating between these two populations?

   • A) Habitat isolation
   • B) Behavioral isolation
   • C) Temporal isolation
   • D) Mechanical isolation
2. 2.

   Two closely related species of fireflies inhabit the same meadow, but females only recognize and respond to the unique flash patterns and pulse rhythms produced by males of their own species. Which type of reproductive isolating mechanism is operating between these populations?

   • A) Mechanical isolation
   • B) Habitat isolation
   • C) Hybrid breakdown
   • D) Behavioral isolation
3. 3.

   Two closely related marine species release sperm and egg cells simultaneously into open water, but biochemical incompatibilities prevent the sperm from binding to receptors on the eggs of the other species. Which reproductive isolating mechanism is operating in this scenario?

   • A) Behavioral isolation
   • B) Mechanical isolation
   • C) Reduced hybrid viability
   • D) Gametic isolation
4. 4.

   A male donkey and a female horse can mate and produce a vigorous adult offspring called a mule, but the mule is sterile and cannot reproduce. Which reproductive isolating mechanism is demonstrated by this example?

   • A) Behavioral isolation
   • B) Gametic isolation
   • C) Mechanical isolation
   • D) Reduced hybrid fertility
5. 5.

   Two closely related species of frogs inhabit the same geographical region, but one species mates exclusively from February to March, while the other mates from May to June. Which type of reproductive isolating mechanism prevents interbreeding between these two frog populations?

   • A) Behavioral isolation
   • B) Mechanical isolation
   • C) Hybrid inviability
   • D) Temporal isolation