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Bio 100 Exam 3 With 100% Correct Answers 2023
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Bio 100 Exam 3 With 100% Correct Answers 2023
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Bio 100 Exam 3 With 100% Correct Answers 2023genetic variation/variation - Correct Answer-raw material for evolution
variation is all around us
same species but different variation
4 sources of variation - Correct Answer-single gene mutation
gene duplication and divergence
exon shuffling
recombination
mutation - Correct Answer-direct CHANGE IN THE DNA of an individual- is the ultimate source of all genetic variation in a population
2 ex of a mutation - Correct Answer-1. sickle cell- one amino acid is not in correct place
2. frog wih two extra legs
mutation is an alteration of what - Correct Answer-the base pair sequence of an individuals DNA
when the alteration of a mutation occurs in a gene, - Correct Answer-the change in the DNA sequence may change the allele
how can gene mutations be caused by - Correct Answer-mistakes in DNA replication
collisions of the DNA molecule with other molecules
damage from heat or chemical agents
mutations in an organisms what can be inherited - Correct Answer-gametes
single gene mutation - Correct Answer-mutations alter old genes
some are harmful, some are helpful, and some are neutral
ex= 1234567891011, mutation= 1234561291011
most single gene mutations are what - Correct Answer-deadly
gene duplication - Correct Answer-chance error created two copies of a gene
one gene retains the original function
a mutated copy takes on a new function
ex= 1234567 parent, 1234567 parent= offspring is 1234267= MINOR CHANGE, offspring- 1284597= MAJOR CHANGE
gene recombination occurs when - Correct Answer-in meiosis genetic recombination - Correct Answer-shuffling the existing alleles around
frequency of alleles in a populations gene pool remains the same
ex= A and B paren, a and b parent= offspring is A and b
would shuffling a deck of cards be a good example of genetic recombination - Correct Answer-No, because there would be a lot more genes
exon shuffling - Correct Answer-exon number change
evolution changed when what occurs in a pop change - Correct Answer-allele frequencies
4 agents of evolution - Correct Answer-mutation
gene flow
genetic drift
natural selection
most important agent of evolution - Correct Answer-natural selection
mutations - Correct Answer-changing an original allele into a new one
natural selection will act upon the new allele
gene flow - Correct Answer-physical flow of alleles into a population through migration
changes in allele frequencies in a pop due to migration or immigration
what is important for the evolution of antibiotic resistant bacteria - Correct Answer-gene flow
genetic drift - Correct Answer-random change in allele frequencies brought about by chance over generations occurring in a small population
2 examples of genetic drift - Correct Answer-bottleneck effect founder effect
bottleneck effect - Correct Answer-severe reduction in a pop size
disease, habitat loss, hunting, natural disaster
causes pronounced genetic drift
CHEETAHS
genetic variation- why is this dangerous for cheetahs - Correct Answer-have very little genetic variation, so interbreeding can occur and they all will be susceptible to disease
founder effect - Correct Answer-effect of a genetic drift when a small number of individuals start a new pop
by chance, allele frequencies of founders may not be the same as those in original pop
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