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Tanya [424]
3 years ago
6

When is genetic drift a major factor in evolution?

Biology
2 answers:
Alex777 [14]3 years ago
6 0

Answer:

B) when there is no selective pressure

Explanation:

Genetic drift refers to a chance act acting over genetic variations or alleles previously distributed evenly over a population, drastically altering the distribution. For example, if I had 100 rabbits with coats white, brown, gray and black and suddenly a disease broke that killed all my black and brown rabbits, the genetic variation allowing for brown and black coats would have disappeared. This is a chance act, as the black and brown rabbits were not intentionally affected. Also there was no selective pressure for rabbits to develop one coat color, that's why the genetic variation was distributed evenly. This is different from artificial selection, as the eradication of black and brown coats was due to a random event, we did not select the coat color like people do for artificial selection.

Anestetic [448]3 years ago
4 0

Some answers can be:

When there is no selective pressure

When there is low gene flow

When there is a bottleneck


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Type II survivorship curves Your answer: are characteristic of humans and elephants. typify a population in which all ages have
Natalka [10]

Answer:

b. typify a population in which all ages have an equal chance of surviving. → YES

e. are typical of annual plants → YES

Explanation:

Different species have survival curves differently shaped. In general terms, there are three different survival curves.

  • Type I. Mortality often occurs at the end of the cycle, representing species with low mortality. Organisms exhibiting this type of survivorship curve have long cycles of life and high probabilities to survive until they are old enough. These species have few descendants and spend too much time and energy in parental care to ensure their reproductive success.
  • Type II. The probabilities of dying are equals all along the cycle, at any age interval. The number of dead individuals remains constant from the beginning to the end of the life cycle. These species have reduced offsprings, and they ensure their reproductive success by providing some significant parental care.
  • Type III. Significant mortality during the early stages of life. Only a few individuals reach the later life stages, getting to survive their first period of life. Survivors usually have a long life. These species produce big offsprings at the same time, but they provide little or no parental care. Their reproductive success relies on the number of descendants.

Type II survivorship curves:

a. are characteristic of humans and elephants → No, this is Type I curve

b. typify a population in which all ages have an equal chance of surviving. → YES

c. indicate a high mortality rate in the very young. → No, this is Type III curve

d. show that very few young are produced, that each is given parental support, and that most  individuals live a relatively long life and die of old age. → No, this is Type I curve

e. are typical of annual plants → YES

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