Exploring Speciation Rates

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Which factor can create a mechanical barrier to mating in Japanese Euhadra snails?

The color of the shell

The size of the snail

The direction of shell spiral (correct)

The shape of the shell

What is a fundamental question in evolutionary biology?

How do mutations occur in genes?

How many genes influence the formation of new species? (correct)

How do species adapt to their environment?

How do species evolve over time?

Which organism requires the change of only a single gene for speciation?

Japanese Euhadra snails (correct)

It depends on the species

All organisms require the change of multiple genes

Monkey flowers (Mimulus)

What do two genes in monkey flowers (Mimulus) affect?

The color of the flowers Signup and view all the answers

Which one of these is a possible reason for the formation of new species?

The removal of incompatible body parts Signup and view all the answers

What does the direction of shell spiral in Japanese Euhadra snails influence?

The mating behavior of the snail Signup and view all the answers

Which organism is mentioned as an example of speciation influenced by a single gene?

Japanese Euhadra snails Signup and view all the answers

What is the main focus of studying the genetics of speciation?

The number of genes involved in new species formation Signup and view all the answers

Which factor influences pollinator choice in monkey flowers (Mimulus)?

The color of the flowers Signup and view all the answers

What is the role of genes in the formation of new species?

Genes influence the adaptation of new species Signup and view all the answers

What does the existence of a punctuated pattern in the fossil record suggest about speciation rates?

Speciation rates can be rapid. Signup and view all the answers

What is an example provided in the text to illustrate rapid speciation through hybridization?

The origin of the sunflower Helianthus anomalus. Signup and view all the answers

How did researchers produce sunflower hybrids experimentally in the lab?

By crossing the parent species of H. anomalus with other sunflower species. Signup and view all the answers

What did genetic analysis of the hybrid offspring show over several generations?

Extensive genetic change over short periods of time. Signup and view all the answers

What percentage of F1 experimental hybrids were able to reproduce?

5% Signup and view all the answers

How did the reproductive ability of the hybrid offspring change after four generations?

It increased by 90%. Signup and view all the answers

What is the main focus of the inquiry mentioned in the text?

How hybridization leads to speciation in sunflowers. Signup and view all the answers

What is the habitat of the hybrid sunflower species discussed in the text?

Dry sand dunes. Signup and view all the answers

How does hybridization contribute to speciation in sunflowers?

Hybridization introduces new genetic combinations. Signup and view all the answers

What does the genetic analysis of the hybrid offspring suggest about the rate of genetic change during speciation?

Genetic change occurs rapidly over short periods of time. Signup and view all the answers