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sexual
variation, usually 2 parents
Sexes
1. MONOECIOUS - male & female in 1 individual
a. HERMAPHRODITIC - animals
2. DIOECIOUS - male & female on separate individuals
Monoecious
male and female in 1 individual
Hermaphroditic
male and female on separate individuals
Fertilization
union of two gametes
External fertilization
outside in female aquatic envt.
a. Broadcast spawning or free shedding – inverts, coral, cod
b. Simultaneous shedding over nest - salmon, grunion
c. Simultaneous extrusion by clasped pair - frogs
Internal fertilization
Inside female
a. Sperm packets
i. Taken in/on by females - spiders, lobsters
ii. Placed in female by male - squid/octopus
b. Copulation - direct transfer of sperm to vagina