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DQ 4.12 CH 23

Authored by Brenda Klauss

Biology

11th - 12th Grade

Used 3+ times

DQ 4.12 CH 23
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10 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of these variables is likely to undergo the largest change in value as the result of a mutation that introduces a brand-new allele into a population's gene pool at a locus that had formerly been fixed?

average heterozygosity

nucleotide variability

geographic variability

average number of loci

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement about the beak size of finches on the island of Daphne Major during prolonged drought is true?

Each bird evolved a deeper, stronger beak as the drought persisted.

Each bird's survival was strongly influenced by the depth and strength of its beak as the drought persisted.

Each bird that survived the drought produced only offspring with deeper, stronger beaks than seen in the previous generation.

The frequency of the strong-beak alleles increased in each bird as the drought persisted.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is a true statement concerning genetic variation?

It is created by the direct action of natural selection.

It arises in response to changes in the environment.

It must be present in a population before natural selection can act upon the population.

It tends to be reduced by the processes involved when diploid organisms produce gametes

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In the formula for determining a population's genotype frequencies, the 2 in the term 2pq is necessary because

the population is diploid.

heterozygotes can come about in two ways.

the population is doubling in number.

heterozygotes have two alleles.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Evolution

must happen, due to organisms’ innate desire to survive.

must happen whenever a population is not well-adapted to its environment.

can happen whenever any of the conditions for Hardy-Weinberg equilibrium are not met.

requires the operation of natural selection.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Over time, the movement of people on Earth has steadily increased. This has altered the course of human evolution by increasing

nonrandom mating.

geographic isolation.

genetic drift.

gene flow.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Adult male humans generally have deeper voices than do adult female humans, which is the direct result of higher levels of testosterone causing growth of the larynx. If the fossil records of apes and humans alike show a trend toward decreasing larynx size in adult females and increasing larynx size in adult males, then

sexual dimorphism was developing over time in these species.

intrasexual selection seems to have occurred.

stabilizing selection was occurring in these species concerning larynx size.

selection was acting more directly upon genotype than upon phenotype.

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