Table of Contents
What conclusion can you draw about the evolution of the Anolis lizards Based on these figures?
What conclusion can you draw about the evolution of the Anolis lizards based on these figures? The lizards are more closely related to lizards on the same island than lizards with the same body type.
Which is the best explanation for why the same types of lizards evolved on each island?
In the film, Jonathan Losos and his colleagues sequenced the DNA of anoles from each island. The DNA revealed that the lizards on each island tend to be more closely related to each other than to similar-looking lizards elsewhere. That means that generally the same types of lizards evolved independently on each island.
How do the dewlap colors of the two species compare?
From the bar graph generated in the virtual lab (see below), how do the dewlap colors of the two species compare? The A. cristatellus has a brighter dewlap by +2.3 and the A. cooki has a darker dewlap by -2.3.
What do the four groups of anoles trunk crown twig trunk ground and grass Bush represent?
What do the four groups of anoles (trunk-crown, twig, trunk-ground, and grass-bush) represent? The four types of anoles in this virtual lab are called ecomorphs. These are groups of lizards that occupy different ecological niches (i.e., “eco”) and have different shapes or morphologies (i.e., “morph”).
Why lizards living in the same part of the habitat ie grass would have similar characteristics?
Lizards in the same habitat would have similar characteristics because there are many ways to do something, however there is only one way that is the best for surviving.
How can resource partitioning promote long term coexistence of competing species thus increasing biodiversity?
Explain how resource partitioning can promote long-term coexistence of competing species, this increasing biodiversity. Resource partitioning can promote long-term coexisting of competing species because species compete for similar resources which don’t help the environment or habitat.
What is convergent evolution and why are anole lizards in the Caribbean an example of this?
That’s because the anoles are an extraordinary example of convergent evolution—where different living things independently acquire the same adaptations to the same challenges. For example, each island has an anole that lives among twigs.
What did the scientists find in terms of how the length of the anole lizards legs affects their ability to survive their environment?
The legs of the anoles placed on the islands became shorter, and their offspring inherited shorter legs. There are many small islands with similar environments, meaning that researchers can repeat their experiments and observations in several locations.
Why are dewlaps different colors?
Species that occupy shaded habitats tend to have yellow dewlaps while those that inhabit brighter, less shaded, habitats, tend to have red or orange dewlaps. Natural backgrounds are formed by green vegetation.
What’s the difference between ecomorph and species?
how is an ecomorph different from a species? An ecomorph is different from a species because ecomorphs on different islands may be distantly related with the same morphology, in a species, all no matter what island they are on, they are all very closely related. Distantly related species containing similar traits.
What ecomorph is Anolis Valencienni?
Trunk-crown anole are usually predominantly green and have relatively large sub-digital toe-pads and short stout legs to aid in arboreal locomotion….Trunk-crown ecomorph.
| Species | Image | Distribution |
|---|---|---|
| Anolis evermanni | Emerald anole | Puerto Rico |
| Anolis grahami | Graham’s anole | Jamaica,introduced to Bermuda |
What observations and evidence have Jonathan Losos and his colleagues gathered to support the theory of natural selection?
What observations and evidence have Jonathan Losos and his colleagues gathered to support the theory of natural selection? On each of the four large Caribbean islands, Losos observed the same distribution of anole lizard body types. DNA evidence suggests that the different lizard body types (twig, grass, etc.)
What is the relationship between interspecific competition and the competitive exclusion principle?
Interspecific competition is a -/- interaction that occurs when individuals of different species compete for a resource that limits their growth and survival. At the end of this competition, the local elimination of the inferior competitor is known as competitive exclusion.
How do plants or animals partitioned their niches in order to reduce competition?
Resource partitioning Competitive exclusion may be avoided if one or both of the competing species evolves to use a different resource, occupy a different area of the habitat, or feed during a different time of day.
What did Dr Losos find in the experiment that he completed on the small islands in the Caribbean?
lizards
What was striking was what Losos observed across the four islands: Not only were the lizards different, but they were different in the same ways. Twig-dwellers tended to be thin and short-legged, for instance (not on one island, but on all).
What are the two evolutionary hypotheses that explain the relationships and distribution of the lizard ecomorphs?
Let’s review the two hypotheses discussed earlier. One hypothesis is that each ecomorph evolved once, and the species belonging to the same ecomorph are closely related to one another. An alternative hypothesis is that the ecomorphs evolved repeatedly and independently on each of the islands.
What did Losos and his colleagues discover about the average hindlimb length of survivors after 6 months?
What did Losos and his colleagues discover about the average hindlimb length of survivors after 6 months and after 12 months? After 6 months, the average hindlimb length of the survivors was longer than that of the population at the start.
Which of the following alternate hypotheses could explain Yoel’s results that on some islands green anole lizards live higher in the trees and have larger toe pads?
Which of the following alternate hypotheses could explain Yoel’s results that on some islands, green anole lizards live higher in the trees and have larger toe pads? The introduction of a predator that lives on the ground caused the green anole lizard population to evolve.
Why is my anole black?
They turn brown in cold, when they’re frightened or when they’re stressed. The brown anoles can’t turn green, but they can switch from brown to gray or black. Both species use hormones to change their color depending upon their mood, temperature and light.