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WorksheetsSelection and Speciation
Total questions: 21
Worksheet time: 13mins
Define natural selection
A process in which individuals that have certain traits tend to survive and reproduce at higher rates than other individuals because of those traits
Natural selection that favors one extreme phenotypes by acting against another extreme phenotypes
Natural selection that act against average phenotype and favors both of extreme phenotypes.
What are the three types of natural selection?
Stabilizing seelction
Artificial selection
Directional selection
Disruptive selection
What type of natural selection does this graph present?
Stabilizing selection
Disruptive selection
Directional selection
What is the definition of directional selection?
Natural selection that favors intermediate or average phenotype by acting against both extreme phenotype.
Natural selection that favors one extreme phenotype by acting against another extreme phenotype
Natural selection that act against intermediate or average phenotype and favors both extreme phenotype.
What is the suitable example of disruptive selection?
Length width of hawk?
Black peppered moth
Size and shape of beak of Finches in Galapagos Island
Which of the statement on natural selection is false?
The selection pressure is human
The selection pressure is enviroment
What is the definition of artificial selection?
Selective reproduction between closely related organism, in order to propagate particularly desirable characteristic.
Crossing between unrelated or distantly related individuals of a species to produce a progeny.
Human intervention in animals or plants reproduction to ensure certain desirable traits are represented in the next descending (next) generation.
What is the example of inbreeding?
Marriage between classmates
Marriage between relatives
Marriage between other species
What are the effects of inbreeding
Loss of vigor ( healthier , larger offspring )
Reduces the variability of genome
Numbers of homozygous phenotype increase
Increase in variation
Which one is a false statement on outbreeding?
The hybrids usually have new and superior phenotypes and have greater potential to adapt to enviromental changes
Increases hybrid vigour or heterozigosity and new opportunities for gene interaction
Hybrid crosses are often stronger (animals) and produces better yield (plants)
What mode of speciation does this picture represent?
Sympatric
Allopatric
Which of these statement on sympatric speciation is correct?
Occurs when two or more population of a species is geographically isolated from one another sufficiently that they do not interbreed.
Requires some form of reproductive isolating mechanism which has arisen from selection within a geographically confined area.
New species will arise within the range of the parents population.
Prolonged separation of population may result in species becoming genetically isolated even being brought together.
What are the example of pre-zygotic isolating mechanism?
Hybrid inviability
Habitat Isolation
Temporal Isolation
Hybrid breakdown
What are the example of gametic isolation?
Certain groups of birds only respond to a species specific mating call
Five species of frog occupy the same habitat but breed during different time
In animals, the reproductive tract of the female produces chemicals that could kill the spermatazoa of another species
Certain breeds of the are morphologically incapable of mating due to size.
Which is the correct example for hybrid infertility?
Hybrids are produced but fails to develop to maturity.
F1 hybrids are fertile, but F2 generation fails to develop properly
Hybrids fail to produce functional gametes.
Choose the processes that leads to speciation
Reproductive isolation
Hybridization
Genetic drift
Adaptive radiation
Which are the similarities between Bottleneck Effect and Founder Effect?
Occurs when a small population colonize a new area
Occurs in chance of event
Occurs when small population is isolate dispersed from a larger original population
Change the allele and genotype frquencies
Which of these statement is true about Bottleneck Effect?
The genetic drift occurs when establishing a new small population, which is isolated from original large population
The genetic drifts that occurs in small surviving population after an environmental disaster
Occurs when the population suddenly reduces in size
Shift from Hardy-Weinberg equilibrium
What are the importance of adaptive radiation?
Organism can adapt with environment changes
Genetic variability is increased
Species may consume different food and reduces competition.
Increase the number of homozygous phenotype
Which process that leads to speciation does this picture represent?
Hybridization
Adaptive Radiation
Genetic Drift
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