Which change would be considered a short-term environmental change? Check all that apply.

9966 [12]

Answer:A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses.

Explanation:

4 0

3 years ago

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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.

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3 years ago

Most people afflicted with recessive disorders are born to parents who were

Marrrta [24]

Most people afflicted with recessive disorder with recessive disorders are born to parents who are not affected at all by the disease. Most genetic disorders of humans are caused by recessive alleles. Dominant alleles on the hand cause lethal disorders, however they are less common compared to the recessive alleles disorders, this is because most individuals carrying a lethal dominant allele have the disorder and they die before pass it to the offspring, while the individuals with the recessive lethal genes are more likely to be healthy and reproduce.

3 0

3 years ago

The energy-producing, or energy-storing, molecule is called _____. ATP glucose protein

Mrrafil [7]

Answer:

This is what ive found on google hope it helps

6 0

4 years ago

For a circular or square patch of habitat, the ratio of edge habitat to interior habitat __________ as the size of the patch dec

kompoz [17]

Answer:

increases

Explanation:

Habitat is defined as a particular environment where a group of organisms normally lives. Some examples of habitat include, among others, forests, deserts, lakes, grasslands, etc. Moreover, an edge habitat refers to a habitat area that is in contact with another. This part of the habitat has ecological importance because it is used by many species in order to find food, refuge and rest. In the question above, it is expected that a greater number of smaller habitats increase edge habitat surface area when compared to the interior habitat area. The ratio between the edge habitat surface area and total habitat area may have a huge impact on entire ecosystems.

7 0

3 years ago