BIOLOGY 1M03 Lecture Notes - Lecture 8: Isogamy, Genetic Recombination, Sexual Selection
Document Summary
If an asexual and sexual species reproduce at the same rate, the asexual species will outcompete the sexual species: the asexual species produces more offspring per generation, this is true if one sex (males) does not produce offspring. Why is genetic recombination useful: potentially can separate good (advantageous) from bad (deleterious) mutations, can unite multiple advantageous mutations from different individuals. In sexual species such as yeast, all individuals are capable of reproduction = isogamous (produce gametes of the same size: with these gametes, no sexual selection is expected because both parents contribute equally to the offspring. Causes of sexual selection: female choice: choose mates based on, physical characteristics that signal male genetic quality (honest advertising and good alleles, resources or parental care provided by males (nuptial gifts, male-male competition. Honest advertising: beak color of male zebra finches is influenced by nutrition.
