Which statement best describes the evolution of complex eyes?
Which of the following statements best describes the evolution of complex eyes? Complex eyes evolved through a series of steps that improved the functioning of the eyes.
Which statement about genetic drift is correct?
Which statement about genetic drift is correct? ANSWER: Genetic drift becomes increasingly important with increasing population size. The direction of evolutionary change due to genetic drift is random.
Why did dark colored rock pocket mice first appear in a population of light colored rock pocket mice?
Why did dark-colored rock pocket mice first appear in a population of light-colored rock pocket mice? They have a genetic mutation that affects their fur color. There is dark lava rock in the area where they live. Individuals change color to blend in with the environment.
What is genetic drift Chapter 24?
What is genetic drift? A change in allele frequencies caused by random events.
What is the significance of the human eye in the history of research on evolution?
Many researchers have found the evolution of the eye attractive to study because the eye distinctively exemplifies an analogous organ found in many animal forms. Simple light detection is found in bacteria, single-celled organisms, plants and animals.
How does an organism’s eyes help it in its environment?
In higher organisms the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain …
What is genetic drift describe its mechanism along with bottleneck and founder effect?
The bottleneck effect is an extreme example of genetic drift that happens when the size of a population is severely reduced. Events like natural disasters (earthquakes, floods, fires) can decimate a population, killing most individuals and leaving behind a small, random assortment of survivors.
What is genetic drift in Brainly?
Brainly User. Answer: Genetic drift is the change in the frequency of an existing gene variant in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces.
Why were there dark colored mice at location A even though the ground was light colored?
Explain the presence of dark-colored mice at location A. Why didn't this phenotype become more common in the population? The dark-colored mice arose in the population at location A by random mutation. The phenotype did not become more common because it did not afford a selective advantage to the mice.
Why are some mice light colored and some mice dark colored?
Why were some mice light colored and some mice dark colored? Some dark mice evolved to be as dark as the rock. The color change is occurred precisely where it would conceal the mice from hunters. The dark mice came to be because the DNA went through a random and spontaneous mutation.
What is genetic drift Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island?
What is genetic drift? Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island? Natural selection favored individuals that were more fit in the new environment. All three answers are correct.
What is genetic drift quizlet?
Genetic drift. Any random change to the allele frequency of a population due to a chance event.
Why is the eye important to the functioning of animals?
In most vertebrates and some molluscs, the eye works by allowing light to enter and project onto a light-sensitive panel of cells, known as the retina, at the rear of the eye. The cone cells (for colour) and the rod cells (for low-light contrasts) in the retina detect and convert light into neural signals for vision.
Why do some animals have multiple eyes?
They went from being able to simply detect light to being able to make out different shapes and then color. Finally, at some point, two eyes developed and this gave the animals the ability to have depth perception. This means that the two eyes work together to help determine how far away things are.
What are the various types of eyes present in animals?
What are the different kinds of animal eye pupils?
- Daytime-hunting large predators tend to have round pupils. …
- Vertical slit pupils tend to belong to ambush predators. …
- Horizontal pupils tend to belong to prey animals. …
- Horizontal slit pupils tend to be found in prey reptiles and amphibians.
How do you think is the bottleneck effect differ and related to founder effect?
A bottleneck effect is when there is a very noticeable reduction in population size for a minimum of one generation time. A founder effect is when a few individuals move to a new region and start a new colony of limited genetic variation.
What is genetic drift Class 10?
Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error). Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.
How migrants change genetic diversity within a population?
Migrants change the distribution of genetic diversity among populations, by modifying allele frequencies (the proportion of members carrying a particular variant of a gene). High rates of gene flow can reduce the genetic differentiation between the two groups, increasing homogeneity.
How does natural selection explain the change with time of darker mice into lighter mice?
Because predators could more easily spot the dark mice on light sand. The lighter mice were more likely to survive and have offspring. Natural selection favored the light mice. Over time, the population became light colored.
Why does the dark fur trait spread so quickly in mice that are on the lava flow?
Why does the dark fur trait spread so quickly in mice that are on the lava flow? Mice with dark fur survive better and can pass on their genes to offspring.
Can a mouse be black?
Mice range in color from white to light brown, dark brown, silver, gray or black. Some mice exhibit dual coloration. White and brown is the most common of these combinations, while some specimens may have white, brown and black coats. Colorful mice are typically bred with those colorations for the pet trade.
Is a black mouse a rat?
Mice have thin, slightly hairy tails; rats have a thicker, hairless, scaly tail. The nose of a mouse is triangular in shape; the nose of a rat is more blunt and rounded. Both mice and rats can be brown or gray in color, but rats can also be black. Mice droppings are approximately 1/4 inch long with pointed ends.
What do the different beaks tell us about the different finch species?
Different finch beak shapes are evidence that finch species adapted to different environments over many generations. Different finch beak shapes are evidence that individual birds changed their beaks so that they could feed efficiently.
What is the best explanation for the different types of beaks in the finches?
d) Different lines of finches developed different beak types because they needed them in order to obtain the available food.
What is a gene pool quizlet?
Gene Pool. all the genes, including all the different alleles for each gene, that are present in a population at any one time. Population. a group of organisms of the same species populating a given area.
How do you think the different types of eyes that have evolved work?
The earliest eyes were probably just simple eyespots that could only tell the difference between light and dark. Only later did some animals evolve spherical eyes that could focus light into images. Crucial to these image-forming eyes was the evolution of lenses that could focus light.
Why do animals have different colored eyes?
The molecular basis of eye coloration variation in domestic animals indicates that blue eyes and other light-colored phenotypes are often related to coat color mutations affecting melanin production.
What animals have multiple eyes?
Invertebrates often have more than two eyes. Most spiders for example have eight eyes that help them spot and hunt prey. A group of marine molluscs called chitons do even better – they have hundreds of eyes dotted all over the armoured plates that cover their bodies.
What are the different types of eyes?
There are six main eye shapes — round, monolid, hooded, downturned, upturned and almond — and they're all fabulous in their own way. You may have also heard the following descriptions for your eyes: wide set, asymmetrical, big, small, close set and deep set.
How many types of eyes are there in the animal kingdom?
eight types … the variety of eyes in the animal kingdom seems astonishing, physical laws have constrained solutions for collecting and focusing light to just eight types of eye optics ( Fig. 1) (2). Animal eyes are not simple photon detectors, but organs that produce an image by comparing light from different directions.