I got 3 wrong can you check? Unlike natural selection, genetic drift is based so

Question

I got 3 wrong can you check?

Unlike natural selection, genetic drift is based solely on _________.

mutations

random events

the phenotype of the individual

migrations

1 points   

QUESTION 2

Which of the following evolutionary forces consistently works to adapt organisms to their environment?

sexual selection

gene flow

mutation

natural selection

genetic drift

1 points   

QUESTION 3

Microevolution can be defined as a change in ______.

the allele frequency within a population over a relatively short time

environmental conditions on a very local level

the types of alleles an individual carries as a result of mutations

the phenotype of an individual resulting from the use or disuse of certain anatomical features

1 points   

QUESTION 4

What is the difference between microevolution and macroevolution?

It is a somewhat arbitrary distinction based on the amount of evolution which has taken place over a time span.

Microevolution describes what happens in small populations, whereas macroevolution deals with large populations.

Microevolution is hypothetical because changes are too small to be observed, whereas macroevolution is detectable.

Microevolution deals with microscopic organisms, whereas macroevolution deals with larger ones.

1 points   

QUESTION 5

Uranium-238 is a radioactive element that will decay into lead-206. It has a half-life of 4.5 billion years, which means that after 4.5 billion years exactly one-half of the total amount of uranium-238 that you started with will have decayed into lead-206. Suppose you were given a 100-gram solid block of uranium-238, and you buried it in the ground. Nine billion years from now, if someone dug it up and analyzed it, how much uranium-238 would be left?

0 grams

50 grams

75 grams

25 grams

100 grams

1 points   

QUESTION 6

In what type of cells must mutations occur before the mutations can be important in evolutionary change within a population?

autosomes

gametes

blood cells

somatic cells

1 points   

QUESTION 7

The term "Natural Selection" is not interchangeable with the term "evolution" because:

Natural Selection does not always lead to evolution.

Natural Selection is just a theory, whereas evolution has been proven.

Darwin coined the term evolution, but not Natural Selection.

a population may evolve in ways other than through Natural Selection.

1 points   

QUESTION 8

An allele is ________.

the gene pool of a population

a particular characteristic

a genotype

a particular version of a gene

1 points   

QUESTION 9

The longer two populations are kept from interbreeding, the:

greater the mutation rate will be.

more recessive alleles will be expressed.

greater the chance one will go extinct.

more they will differ from one another in gene pools.

1 points   

QUESTION 10

One of the reasons that natural selection works on populations rather than on individuals is that _____________.

Natural selection only brings about macroevolution (which only applies to populations), and not microevolution (which only applies to individuals)

populations are too large for natural selection to have an effect

populations have different genes than do individuals

individuals can develop new alleles, but populations cannot

A population has many generations over which the allele frequency can change, whereas an individual's alleles don't change

1 points   

QUESTION 11

Which of the following could be considered a definition of "evolution"?

a change in the genetic makeup of an individual

a change in the physical characteristics of an individual

a change in environmental conditions

a change in the gene pool (sum of the alleles) of a population

1 points   

QUESTION 12

A population is ___________.

only groups of animals; plants do not qualify as populations.

all of the organisms in an ecosystem

all of the organisms in a given area

members of the same species in a given area

1 points   

QUESTION 13

One of the reasons that natural selection can bring about evolution is because of variation in the genetic material of a population. What is the ultimate source of the variation in genetic material?

genetic mutations

the number of offspring produced by an organism

the life span of an organism

the feeding habits of a species

1 points   

QUESTION 14

On a remote Pacific island, exists a species of rabbits can which have very short ears. During a storm, a crate containing live long-eared rabbits of the same species is washed over the side of a ship and eventually washes onto the shore of the island. This event causes the rabbit population of island to be immediately be changed from all short-eared rabbits to one in which 80% of them have short ears and 20% have long ears. This would be an example of microevolution through ______.

genetic drift

natural selection

gene flow

mutation

1 points   

QUESTION 15

A group of organisms that can successfully interbreed...

shares the same phenotype

is very difficult to find in nature.

is referred to as a species

shares the same genotype

1 points   

QUESTION 16

Evolution that results in the formation of new species or other large groupings of living things is defined as _____________.

microevolution

macroevolution

genetic drift

natural selection

a.

mutations

b.

random events

c.

the phenotype of the individual

d.

migrations

Explanation / Answer

1. b. random events.

Unlike natural selection, genetic drift is based solely on random events.

2.d. natural selection

Natural selection consistently works to adapt organisms to their environment.

3.a. e allele frequency within a population over a short period of time.

Microevolution can be defined as a change in the allele frequency within a population over a short period of time.

4. a. It is a somewhat arbitrary distinction based on the amount of evolution which has taken place over a time span.

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