A polar bear has thick, white fur that camouflages it when it sits on snow. Which type of adaptation is this modification?

Populations evolve for many reasons. Suppose there is a small population of birds that have either brown chest feathers or yello

creativ13 [48]

Answer/Explanation:

A. Birds with yellow chest feathers attract more mates and leave more offspring.

Mechanism: The mechanism that is involved in this event is imply that of natural selection. In this event, birds with yellow chest feathers have a greater fitness they attract more mates and leave behind more offspring, as they are selected for by natural selection.

Effect on the gene pool: Since birds of yellow chest feathers have greater fitness, the frequency of yellow feather birds would increase, since more offspring with yellow chest feathers would be produced more than the other bird having the other feather color.

B. A hurricane kills many birds at random.

Mechanism: The mechanism that occurs in this event is simply that of genetic drift. Here, a random change has occurred, which can simply be referred to as the bottle neck effect. Following the disaster, the population size of the bird reduces thereby increasing the chance of allele frequency of the population to change. Genetic drift is occurs more in a small population.

Effect on the gene pool: Allele frequency would change, but not predictably. In other words, since individuals left are chosen by random, and no real idea of which traits would have the highest fitness after the event, we cannot really tell which the pattern of change the allele frequency would take, but we are certain there would be a change in allele frequency.

C. A conservation group releases several new birds to the area, to repopulate the birds. The new birds are predominantly brown feathered.

Mechanism: This event can be described as gene flow, as new members with mostly brown feather are introduced into the population which would eventually bring a change in the gene pool.

Effect on the gene pool: The frequency of brown feather allele will increase. Bearing in mind that the allele frequency of brown feather allele and yellow feather allele is approximately equal, an introduction of new set of birds having mostly brown feathers would definitely bring about a change in the gene pool, leading to more brown feather allele. Hence, frequency of brown feather allele will increase.

8 0

4 years ago

Sensory cells in the human eye can detect changes in light. The information obtained from these sensory cells is transmitted to

BabaBlast [244]

The answer is D. requires communication between cells and an organ system.

Explanation: Just be happy I answered the question for you!✔

8 0

4 years ago

Abnormally slow depolarization of the ventricles would most change the shape of the ________ in an ECG tracing. Group of answer

NeTakaya

Abnormally slow depolarization of the ventricles would most change the shape of the QRS complex in an ECG tracing.

The conduction system in the ventricles depolarizes, and this depolarization spreads along the walls of the ventricles to produce the QRS complex.
It represents electrical activity that occurs before the ventricles contract (ventricular systole). The QRS complex appears immediately after the onset of ventricular systole.
An aberrant depolarization of the ventricles results in the formation of an abnormal QRS complex.
The SA node, an ectopic pacemaker in the atria, AV junction, bundle branches, Purkinje network, or the ventricular myocardium are all possible pacemaker sites in these aberrant QRS complexes.
An aberrant QRS complex might have any shape, from normal to wide and odd to slurred and notched.

learn more about QRS complex here: brainly.com/question/10842164

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8 0

2 years ago

Which of the following equations best summarizes photosynthesis?

Alik [6]

The correct answer is: B) 6 CO2 + 6 H2O ? C6H12O6 + 6 O2

Photosynthesis is a process of converting light energy to chemical energy in the form of sugars (carbohydrates). It is performed by plants, some algae and bacteria.

In the reaction of photosynthesis, sun energy combined with carbon dioxide (CO2) and water (H2O), to form glucose (C6H12O6) and oxygen (O2). Photosynthesis consists of two stages: the light-dependent reactions (in thylakoid membrane) where ATP is formed and the Calvin cycle (in stroma) where ATP is used.

6 0

3 years ago

Read 2 more answers

________ transport oxygen from the lungs to the body tissues and carry carbon dioxide back to the lungs

DENIUS [597]

Blood

The blood transports oxygen from the lungs to the cells of the body, where it is needed for metabolism. The carbon dioxide produced during metabolism is carried back to the lungs by the blood, where it is then exhaled (breathed out).

3 0

3 years ago