BIOL 1500 Chapter Notes - Chapter 4: Allele Frequency, Assortative Mating, Homo Sapiens

• School: University of Guelph
• Department: Biology
• Course: BIOL 1500
• Professor: marie Thérèse Rush- Smyth

Document Summary

In the mid-1700"s carl linnaeus treated a binomial classification system for classifying species: binomial nomenclature. States that a species is a group of individuals that can interbreed and create fertile offspring, but cannot breed with other groups. Reproductive isolation - reproduction cannot occur due to pre-fertilization and post-fertilization barriers. Pre-fertilization barriers prevent fertilization and include: spatial isolation - species can"t come in contact therefore cant mate, behavioural isolation - mating cant take place without a certain behavioural display or ritual. Specific mating displays: mechanical isolation - sexual organs don"t fit together, temporal isolation - two individuals are not fertile at the same time, gamete incompatibility - egg from one species cannot fuse with the egg of another. Post-fertilization barriers occur when fertilization can but hybrid-offspring can"t survive or cannot reproduce. They include: hybrid inviability - zygote is formed but the developing offspring dies in early development, hybrid sterility - hybrid offspring is produced however it is unable to produce offspring.