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Bio Unit 3 Sec 4 #4

Bio Unit 3 Sec 4 #4: Lector's 29

QuestionAnswer
The formation of a new species when a population develops genetic distinctiveness and becomes reproductively separate Speciation
A group of individuals that can interbreed AND produce viable offspring Species
Environmental Pressures means ________ Selection Natural
In ________, a population is split so that the two new groups cannot interbreed and exchange alleles Speciation
In speciation, evolution takes place so that the ________ of the individuals in each new population ________ over time Characteristics; Change
In speciation, the changes in each group are different because the selective pressures are _____ for each group Different
In speciation, over time the individuals in the two populations become so different they can no longer _____ and produce viable _____ Mate; Offspring
In speciation, ____ new species are a result, which is called ______ 2; Divergence
In short, speciation if the production of 2 new ________, which is called __________ Species; Divergence
Factors that affect allele frequencies in a population include ______, migration, sexual selection, and genetic _______ Mutation; Drift
When random changes in an organism genome create new alleles and allele combinations Mutation
When organisms move in and out of populations, removing alleles or introducing new alleles Migration
When preferential mate selection increases the frequency of desires alleles (ex. birds of paradise) Sexual Selection
When changes in allele frequencies in a population due to chance and alleles do not get passed on to the offspring Genetic Drift
Genetic drift is most impactful when populations are _____ Small
4 types of speciation:_______; Peripatric; Parapatric; _______ Allopatric; Sympatric
Speciation that occurs when large geographic barriers split a population into two large, separate populations Allopatric Speciation
Speciation that occurs when a few individuals from a population colonize a new geographical area and genetic drift causes rapid speciation in the new small populations Peripatric Speciation
Peripatric speciation is also called Adaptive _______ Radiation
Adaptive radiation got its name because the individuals are radiating into new _______ in small numbers and adapting to the new environment Environments
Speciation that occurs when populations expand their range and encounter new habitat with new selective pressures (ex. Ensatina salamanders) Parapatric Speciation
Speciation that results from reproductive isolation with a population that shows no spatial separation Sympatric Speciation
Allopatric speciation is the most _______ forward type of speciation Straight
______ in plants is an example of sympatric speciation Polyploidy
Polyploidy occurs when there is failure in _____ and the gametes that are diploid come together and form polyploid offspring Meiosis
_______ selection/sexual selection is preference for _____ combines with differing microhabitats within a population that results in speciation Diversifying; Traits
Africa's lake fish, ______ are an example of diversifying selection/sexual selction Cichlids
Created by: scarangelo
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