Biology 1001A Lecture Notes - Lecture 15: Parental Investment
24 Nov 2017
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Lecture 15 notes: how environmental stability influences whether sexual or asexual reproduction is favoured. Asexual reproduction is often very common is environments that don"t change to much. When the environment is changing, offspring will experience more selective pressures: lottery principle and red queen principle as environmental (short- term) benefits of sex. Females are constrained with how many offsprings they can produce while males can just keep going: distinction between intrasexual selection and intersexual selection. Intrasexual selection is selection within the same sex. For example, some male animals compete against one another, physically, for access to females. So something like big antlers, huge sharp teeth, or similar weaponry that can be used against other males of the species as a means of mating with females is a selective advantage. Intersexual selection is selection between the two sexes. For example, the bright plumage of a male peacock does not help it physically overcome rival males.
