What Lake Is Located Between Bear Paw Lake And Frog Lake Just To The North?

What is an important difference between Bear Paw Lake and Frog lake?

difference is that Bear Paw Lake is completely enclosed and does not drain at the surface. This means that predatory fish cannot readily enter the lake. On the other hand, Frog Lake is connected to the water system by a small stream, which allows predatory fish to gain access to the lake.

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Why did the sticklebacks in Bear Paw Lake have reduced or absent pelvises?

When sea-run stickleback colonized freshwater lakes, some of the populations changed dramatically. Because stickleback in Bear Paw Lake lack pelvic spines, we can infer that over time, the sea-run stickleback that founded this population evolved a reduced pelvis.

What does it mean to reject the null hypothesis for Bear Paw and Coyote lakes?

We can reject the null hypothesis for Bear Paw Lake but not Coyote Lake. Correct! Your answer: C Why? The probability is less than 0.05 for both lakes. This means that the null hypothesis (i.e., your expectation of50:50) can be rejected for Bear Paw Lake and Coyote Lake.

What happened to these fish as they adapted to living exclusively in freshwater?

What happened to these fish as they adapted to living exclusively in fresh water? As they adapted to life in fresh water, all stickleback populations living in lakes in Alaska underwent exactly the same evolutionary changes.

Why are the stickleback fish in Frog Lake more similar to ocean and sea-run stickleback than they are to those in Bear Paw Lake?

Most stickleback fish in Bear Paw Lake have either a reduced or an absent pelvis, whereas those in Frog Lake have a complete pelvis. Thus, the stickleback population in Frog Lake is more similar to marine and sea-run stickleback populations.

Do you reject or fail to reject the null hypothesis for the data from each lake?

The p value for the data for Bear Paw Lake and Frog Lake is less than 0.05, which means that the null hypothesis (i.e., your expectation of 50:50) can be rejected. The p value for the data for Morvoro Lake is greater than 0.05; thus, the null hypothesis cannot be rejected.

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Why did stickleback lose its spines?

One adaptation was the loss of pelvic spines, which are homologous to the hind limbs of four-legged animals. Scientists have determined that changes to the stickleback pelvis are largely due to changes in a particular gene regulatory switch, a stretch of noncoding DNA sequence that functions to turn genes on or off.

Why did the stickleback fish lose its spines?

Elsewhere in the bodies of the marine fish, Pitx1 was just as active as in freshwater fish, suggesting that a change in the gene’s regulation–and not in the gene itself– caused the lake sticklebacks to lose their spines, the team reports in the 15 April issue of Nature.

Why do sticklebacks have spines?

The many stickleback populations underwent disparate and parallel evolutionary changes, among them partial or complete loss of their pelvic spines. These spines are thought to protect the fish from being devoured by predators.

What does it mean to reject the null hypothesis?

If there is less than a 5% chance of a result as extreme as the sample result if the null hypothesis were true, then the null hypothesis is rejected. When this happens, the result is said to be statistically significant.

How did ancestral populations of ocean-dwelling fish?

How did ancestral populations of ocean-dwelling fish come to live in freshwater lakes? became trapped in these lakes and adapted to living exclusively in fresh water. generations, these genetic variants and the associated traits increase in frequency in the population.

Why are sticklebacks good for studying evolution?

Scientists have pinpointed mutations that may help a tiny armoured fish to evolve quickly between saltwater and freshwater forms. In as few as ten generations — an evolutionary blink of an eye — marine sticklebacks can swap their armoured plates and defensive spines for a lighter, smoother freshwater form.

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Why do these spines reduce fitness in lake fish?

organism’s morphology. Ocean stickleback have bony side plates and pelvic spines as protection from predators. In Bear Paw lake, pelvic spines reduce fitness and chances for reproduction because predators grab the spines; most fish have no pelvic spines.

What is one similarity between the evolution of stickleback fish and superbugs?

The similarity between the evolution of the stickleback fish and super bugs is that they are both not mamals.

Why do some stickleback populations lack pelvic spines in sea water pelvic spines help fish swim faster but not in fresh water the pelvic spines are homologous to legs in four-legged animals because fish don’t need Hind?

Why do some stickleback populations lack pelvic spines? In seawater, pelvic spines help fish swim faster, but not in freshwater. The pelvic spines are homologous to legs in four-legged animals. Because fish don’t need hind limbs to walk, many populations of fish evolved to lack pelvic spines.

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