What is the difference between directional selection and disruptive selection

1 answer:

8 0

Directional selection is where one phenotype is favored, so an example would be "a population of madagascar hissing cockroaches suffers heavy predation from lizards. Because their heads are small, the lizards are unable to eat the very largest adult cockroaches, and instead prey upon small and medium sized adults, so as a result the large cockroaches are favored and live".
Meanwhile, disruptive selection is where both extreme phenotypes are favored, an example would be "a population of rabbits can have black fur, white fur or grey fur. This population of rabbits lives in an area of white rocks. When a local volcano erupts, black volcanic rock now dots the landscape amongst the white rocks. Now the black and white rabbits live longer because the black and white spots on the landscape camoflauge them. The two extreme phenotypes are being favored."

You might be interested in

When pushing a box across a floor, it is the pushing force times the distance between the starting and ending point:

julia-pushkina [17]

Answer: Your answer should be kinetic energy

Explanation: Kinetic energy moves while potential is stored and it’s not work or force. Hope it helps!!!

6 0

3 years ago

Read 2 more answers

Which is a possible reason for the transition of algae from unicellularity to multicellularity? A) the transition to multicellul

galben [10]

A possible reason for the transition of algae from unicellularity to multicellularity would be the evolution of multicellularity allowed algae to develop traits that keep them close to the land and thus a source of nutrients. The correct answer between all the choices given is the last choice. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

6 0

3 years ago

Biju RD, Wu J, Hussain Z. Tension pneumocephalus after skull base surgery. A case report and review of literature. J Clin Neuros

inn [45]

The term "pneumocephalus" refers to the condition in which air is present in the cranial cavity.

What happens in pneumocephalus?

Increased intracranial pressure causes tension pneumocephalus, a neurosurgical emergency that can cause headaches, seizures, loss of consciousness, and even death.
Clinically separating the two entities is difficult but essential.
Tension pneumocephalus following skull base surgery was found to be a rare phenomenon with just eleven cases described, according to a survey of the literature on PubMed/MEDLINE.
After treatment, the majority of patients experienced full symptom relief.
Following skull base surgery, tension pneumocephalus is a potential complication that clinicians should be aware of.
An understanding of imaging characteristics and a high level of suspicion are necessary for accurate diagnosis. Rapid management is essential to avoid potentially disastrous effects.

Learn more about human skull with the help of the given link:

brainly.com/question/4537715

#SPJ4

3 0

1 year ago

A student in your physiology lab is thirsty and decides to sneak a drink of deionized or distilled water. the student drinks a f

allsm [11]

As stated in the question, a student who is thirsty decides to sneak a drink of deionized or distilled water. Given the fact that he drank a fairly large quantity of this water in a short period of time, it will cause the student's cells to swell.

5 0

3 years ago

4. What is the significance of double fertilization in angiosperms?

Reika [66]

Answer:

Double fertilization is a significant feature in angiosperms or flowering plants. 

Explanation:

The pollen grains carrying the sperm cells from a flower land on the stigma which is a component of the female reproductive part of a flower. The pollen grain contains the sperms and once the pollen lands on the stigma it grows pollen tub into the ovary through the style which is a tube connecting stigma to ovary.

Ovary contains ovule which contains egg cell as well as two polar nuclei and all these are haploid. The sperm in the pollen is also haploid. On the release of two sperm cells, one sperm fuses with the egg cell and the other sperm fuses with the two polar nuclei which results in the formation of a diploid zygote which is diploid and a triploid cell.

The diploid zygote develops into the embryo after cell division and the triploid cell develops into endosperm that provides nourishment to the embryo. Thus double fertilization becomes significant in flowering plants. 

3 0

3 years ago