Speciation
Biology ⇒ Evolution and Diversity
Speciation starts at 9 and continues till grade 12.
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See sample questions for grade 9
A population of insects is split by a new river, and over time, the two groups become different species. What type of speciation is this?
Describe how natural selection can contribute to speciation.
Describe the difference between prezygotic and postzygotic barriers.
Describe what is meant by 'hybrid breakdown'.
Describe what is meant by 'hybrid inviability'.
A population of insects is split by a new river, and over time, the two groups become different species. What type of speciation is this?
A population of frogs lives in a large forest. Over many generations, some frogs begin to breed only at night while others breed only during the day. Eventually, these two groups can no longer interbreed. What type of reproductive isolation has occurred, and how could this lead to speciation?
A scientist observes that two populations of beetles living on opposite sides of a wide valley have developed different coloration and mating behaviors. After several generations, they can no longer produce fertile offspring together. Which process most likely led to the formation of these new species?
Which of the following best describes reproductive isolation?
(1) When two populations can interbreed
(2) When two populations cannot interbreed and produce fertile offspring
(3) When two populations live in the same area
(4) When two populations share the same food source
Which of the following is a postzygotic barrier?
(1) Habitat isolation
(2) Hybrid sterility
(3) Behavioral isolation
(4) Temporal isolation
Which of the following is an example of allopatric speciation?
(1) A population of birds separated by a mountain range
(2) Two populations of fish in the same lake
(3) Plants in the same field flowering at different times
(4) Insects attracted to different colors of flowers in the same area
Which of the following is an example of behavioral isolation?
(1) Two species of crickets have different mating calls
(2) Two species of plants flower at different times
(3) Two species of fish live in different lakes
(4) Two species of birds have different beak shapes
Fill in the blank: __________ isolation occurs when two populations are separated by physical barriers such as rivers or mountains.
Fill in the blank: The __________ concept defines a species as a group of organisms that can interbreed and produce fertile offspring.
Fill in the blank: The accumulation of genetic differences between populations over time is called genetic __________.
Fill in the blank: The formation of a new species without geographic isolation is called __________ speciation.
True or False: Allopatric speciation occurs when populations are geographically separated.
True or False: Behavioral isolation can occur when two populations have different courtship rituals.
True or False: Gene flow between populations increases the chances of speciation.
True or False: Hybrid sterility is a postzygotic barrier to reproduction.
