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AP Bio Ch. 24,25

Vocab

TermDefinition
Habitat Isolation 2 species occupy different habitats in same area but rarely have encounters (prezygotic reproductive barrier)
Temporal Isolation Species that breed at different times of the day/season/year cannot mix gametes (prezygotic reproductive barrier)
Behavioral Isolation Differences in courtship rituals prevent two species from mating (prezygotic reproductive barrier)
Mechanical Isolation Mating is attempted, but morphological differences prevent successful completion (prezygotic reproductive barrier)
Gametic Isolation Sperm of one species cannot survive to fertilize eggs of another species (prezygotic reproductive barrier)
Reduced Hybrid Viability Genes of different parent species create a weak hybrid with low survival chance (postzygotic reproductive barrier)
Reduced Hybrid Fertility The genes of different parent species produce a sterile offspring (postzygotic reproductive barrier)
Hybrid Breakdown Parents that are of different species produce a strong hybrid, but the offspring of the hybrid is weak and has a low survival rate
species a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring but do not produce fertile offspring with members of other groups
allopatric speciation gene flow is interrupted when a population is divided into geographically isolated subpopulations
sympatric speciation speciation occurs that live in the same geographic area
polyploidy some generation has an extra set of chromosomes
protobionts droplets with membranes that maintained an internal chemistry different from that of their surroundings
relative dating sequence of which fossils are laid
absolute dating describes how old a fossil is in a matter of years
radiometric dating determines absolute age, measures the decay of carbon
hybrid zone region in which members of different species meet and mate
3 possible outcomes of hybrid zones polyploidy, fusion, stability
fusion weaken reproductive barriers, 2 species become increasingly alike
stability continued formation of hybrids
reinforcement strengthen reproductive barriers
Created by: JuliaKibler13
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