BIOL 1902 Lecture Notes - Heterosis

• School: Carleton University
• Department: Biology
• Course: BIOL 1902
• Professor: Michael Runtz

Document Summary

Pheromones = sexual perfumes (please note that there are other. Types:,wasps have defensive = attack pheromones; mammals also. Mammals have sexual pheromone glands near genitals, often. Pheromones inform potential mate that sender is ready for. Breeding; can also serve to stimulate female to ovulation: hares, Porcupines, snakes, moose, deer use pheromones in courtship. Insects: uses is well developed in moths especially silk moths; Males huge antennae - more than four million pores just to capture. Female"s pheromones; males can detect from several kilometers. Pheromones offer advantages: they are species specific - coded messages, they are long range, they are persisting. Courtship gift giving: most common in small predatory animals: Real risk faced by amorous males - may be mistaken for food. Entice a female to accept a mate and to keep the suitor alive. Other ways of avoiding being a meal during courtship: male orb- Weaver spiders are often miniscule (tiny) compared to the female;