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Ch 7 (Part 2)
Terms in this set (31)
random discrepancy between theoretical expectations and actual results.
Sampling error in the production of zygotes
Founder effect is a direct result of _______ _______
Birds native to Tasmania and Australia that colonized New Zealand
founder effect prediction: each new population will give a randomly chosen subset of alleles present from the _________ populations.
Loss of genetic diversity, some alleles are totally gone (due to natural disasters,...)
________ mutations are harmful to organisms
_______ can be cause by radiation, hazardous chemicals, and environmental factors.
A single nucleotide (base) is changed; this is also referred to as substitution
A segment of DNA breaks and is inserted back into its original position in the reverse direction.
__________ __________ favors individuals near one end of the phenotypic spectrum.
__________ ____________ favors individuals w/ intermediate phenotypes
__________ ____________ favors individuals w/ extreme phenotypes
In Directional selection, fitness increases (or decreases) with the_____ of the trait.
Changes average ____ of trait in popn
Reduces variation in popn (not drastically)
Stabilizing selection doesn't alter ________ of the trait in a popn
reduces the number of individuals in the _____ of the trait's distribution (reduces variation)
Stabilizing selection doesn't alter ________ of the trait
Trims off the ____ of the trait distribution, increasing the _______
Birds studied in case study of disruptive selection?
Ground finches went through disruptive selection. This was seen because the birds w/ small or w/ large beaks were the most common and less common were those w/ _______ sized beaks.
___-_______ ________ occurs when individuals select mates with similar genotypes.
inbreeding increases ________ _________ individuals, causing a reduction in fitness (_______ _________)
homozygous recessive, inbreeding depression
Genetic _______ sometimes used to alleviate inbreeding depression.
______ can hide reecessive alleles from the action of natural selection
_______ selection maintains more than one allele.
_________ prevents harmful, recessive alleles from leaving population
Natural selection preserves balanced selection when
•Heterozygotes have _______ relative fitness
•When different alleles are ____________ in different environments
•When the _______ of a phenotype provides a selective advantage
higher, favoured, rarity
Heterozygote Advantage maintains high proportions of __________ alleles
(Heterozygotes selectively favoured even if homozygotes are selected against)
In inbreeding when some genotypes make it from one gen. to the next, the % of heterozygotes decline by ____ and the % of homozygotes increases ___.
(allele freq doesn't change)
-Inbreeding simply affects how genotypes are "________" into diploid zygotes
-This can lead to _________ ______ (decrease in average fitness of inbred individuals)
packaged, inbreeding depression
-_________alleles tend to be "unmasked" more in an inbred population (more homozygous recessives)
-This is typically harmful or even lethal
-Can be resolved with _________ (genetic rescue)
Deleterious , outbreeding
Animal Suffering of inbreeding depression
(Were once widespread across the nation but then git reduced to 20-25 adults)
Recommended textbook explanations
Kenneth R. Miller, Levine
Kenneth R. Miller, Levine
Nelson Science Perspectives 10
Christy C. Hayhoe, Doug Hayhoe, Jeff Major, Maurice DiGiuseppe
Texas Science Fusion: Grade 7
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