BIO 101 Lecture Notes - Lecture 22: Parental Investment, Gastrulation, Ovoviviparity

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Kill and consume all or most of their prey. 1-sit and waiter (sit and wait unil prey is close by) Asexual-without sex, mitosis budding off parent, internal buds, fragmentation (cuts down on variation-disadvantage, survive equal well or not at all) Ovum develops into a new individual without fertilization. Happens when a lack of males around in particular species. In some species there is an alternation between sexual and asexual reproduction. No variation-if the parent has a genetic disease, offspring does too. Allows for variation: the more fundamental elements of evolution. Species that can adapt to a new environments and that cannot be wiped out by a single disease. Ex: frogs-female release eggs into the water and male release sperm over the egg so some eggs are fertilized. Males produce sperm packets, females pick them up and insert them. In some insects, males remove other male"s sperm packets from the female. Viviparous species-the female carries the offspring and give birth.

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