Answers24 - 25 CR - Biology B 0411KBFactors Affecting Genetic Variation-Standard Bio 4.3

Factors Affecting Genetic Variation-Standard Bio 4.3 Answers

10 verified answers
1
Free Preview

best

t
the sum of all genetic traits in a population’s individuals at a given time
a
any movement of genes from one population to another
a
any movement of organisms from one environment to another
t
the random change in the frequency of an allele in a population
2
Free Preview

most likely

Question illustration
T
The beetle population moved to a greener habitat.
A
A natural disaster almost caused the extinction of the population.
T
The beetle population’s food sources decreased dramatically.
A
A mutation resulted in a new color of insect.
3

least

A
A pesticide poisons and kills a large number of chipmunks.
A
A group of chipmunks moves to a new habitat.
A
A number of chipmunks die due to old age.
A
A genetic mutation causes some of the chipmunks to have larger eyes.
4

A population of birds lives on a small island. Another population of the same species lives on the mainland. The distance between the island and the mainland is too great for birds to fly back and forth. Recently, a series of sandbars and tiny islands have formed between the island and the mainland. What is the most likely effect of this?

a
an increase in mutations in both bird populations
a
an increase in gene flow between the bird populations
a
an increase in genetic drift between the bird populations
a
an increase in mutations in the island population
5

A group of students is walking in the park, and one of them takes a picture of a pollen grain that is being blown by the wind. What caption can the student use for this picture?

g
gene mutation in action
g
gene flow at work
g
genetic drift as it happens
n
natural selection in progress
6

A new pesticide has been introduced to the habitat of this population of beetles.Which describes the effect of this environmental change?

Question illustration
d
decreased genetic variation
i
increased genetic variation
g
genetic drift
g
gene flow
7

most likely

g
gene flow
n
natural selection
g
gene mutation
g
genetic drift
8

Genetic drift in a population affects the gene pool in which of the following ways?

d
decrease in genetic variation
i
increase in genetic variation
i
increased in mutations
d
decreased in gene flow
9

most likely

T
The frequency of dominant alleles will slowly increase.
T
The gene pool of the population will remain relatively constant.
T
The genetic variability of the population will slowly decrease.
T
The frequency of dominant and recessive alleles will equalize.
10

Environmental factors can influence natural selection because they can increase or decrease

t
the number of chromosomes in an individual.
t
the number of chromosomes in a population.
t
the amount of genetic variation in an individual.
t
the amount of genetic variation in a population.

Did you find these answers helpful?

More from this Course

Quiz
9 verified answers

Factors Affecting Biological Diversity

Quiz
3 verified answers

Factors Affecting Biological Diversity

Quiz
2 verified answers

Factors Affecting Genetic Variation