Speciation
Biology ⇒ Evolution and Diversity
Speciation starts at 9 and continues till grade 12.
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A group of insects starts feeding on a new type of plant in the same area as the original population. Over time, they only mate with others on the same plant. What type of speciation is this?
A population of birds is separated by a newly formed canyon. Over thousands of years, the two groups develop different mating calls and cannot interbreed. What type of speciation has occurred?
A population of fish is divided by a dam. After many generations, the two groups can no longer interbreed. What is this process called?
Describe how polyploidy can lead to speciation in plants.
Describe the difference between allopatric and sympatric speciation.
A group of insects starts feeding on a new type of plant in the same area as the original population. Over time, they only mate with others on the same plant. What type of speciation is this?
A population of birds is separated by a newly formed canyon. Over thousands of years, the two groups develop different mating calls and cannot interbreed. What type of speciation has occurred?
A population of fish is divided by a dam. After many generations, the two groups can no longer interbreed. What is this process called?
Which of the following best describes reproductive isolation?
(1) When two populations can interbreed freely
(2) When two populations cannot interbreed and produce fertile offspring
(3) When two populations share the same habitat
(4) When two populations have the same diet
Which of the following is an example of a prezygotic barrier?
(1) Hybrid sterility
(2) Temporal isolation
(3) Hybrid breakdown
(4) Reduced hybrid viability
Which of the following is an example of behavioral isolation?
(1) Two species of frogs have different mating calls
(2) Two species of plants flower at different times
(3) Two populations are separated by a mountain
(4) Hybrids are sterile
Which of the following is an example of ecological isolation?
(1) Two species breed at different times
(2) Two species live in different habitats within the same area
(3) Two species have incompatible reproductive organs
(4) Hybrids are sterile
Fill in the blank: The __________ model suggests that species remain unchanged for long periods, with rapid changes occurring in short bursts.
Fill in the blank: The formation of a new species without geographic isolation is called __________ speciation.
Fill in the blank: The gradual accumulation of small genetic changes over time is known as __________ evolution.
Fill in the blank: The process by which new species arise from a single ancestral species while inhabiting the same geographic region is called __________ speciation.
True or False: Allopatric speciation occurs when populations are separated by a physical barrier.
True or False: Gene flow between populations increases the likelihood of speciation.
True or False: Hybrid sterility is a postzygotic reproductive barrier.
True or False: Parapatric speciation occurs when populations are completely isolated from each other.
