Question 1

If the frequency of the dominant gene is 0.7,what is the frequency of the recessive gene?

Accepted Answer

The Hardy and Weinberg equation is p2 + 2pq + q2 = 1, with p representing the frequency of the dominant allele and q representing the frequency of the recessive allele. The frequency of the occurrence of alleles cannot be greater than 100% or 1, therefore p + q = 1. In this case p = 0.7 so the equation becomes 0.7 + q = 1. Solving for q gives a frequency of 0.3 for the recessive allele.Bloom's

Question 2

A student proposes that left-handedness is a recessive trait that is therefore hidden in much of the human population.A survey of a class of 36 students finds that 27 (0.75)are right-handed and 9 (0.25)are left-handed.Using the Hardy-Weinberg formula,what would the expected genotype and allele frequencies be in this theoretical population?

Accepted Answer

The Hardy-Weinberg equation is p2 + 2pq + q2 = 1, with p representing the frequency of the dominant allele and q representing the frequency of the recessive allele. The frequency of the occurrence of alleles cannot be greater than 100% or 1, therefore p + q = 1. Since 9 students are recessive (rr) then the frequency of q2 would be .25, the q = .5. The frequency of the dominant allele would be p = .5. The frequency of the homozygous dominant genotype would be p2 (.5 x .5 = .25). The frequency of the heterozygous genotype is 2pq (2 x .5 x .5 = .5).Bloom's

Question 3

Which of the following is true about genetic drift?

Accepted Answer

Genetic drift is a random change in allele frequencies in a population. If a population is very large, changes in allele frequencies due to chance alone are insignificant. In small populations these same changes can have profound effects on the overall genetic makeup of the population. It can even lead to the complete loss of one or more alleles or to a more frequent occurrence of rare alleles.Bloom's

Question 4

Which of the following does NOT reflect(s)the likely presence of a gene mutation(s)?

Accepted Answer

All of these show the effects of some type of mutagen leading to changes in DNA that are passed on to offspring except for offspring and parent types maintaining the same color patterns.Bloom's

Question 5

A variety of genotypes and phenotypes in a population is useful because it

Accepted Answer

Natural selection can only act on the phenotypes that are present in the population, the more diverse the population (and its genetic makeup) the more likely it is that one or more of the phenotypes will be able to survive as environmental conditions change.Bloom's

Question 6

Social research indicates that a person is most likely to marry someone from the same village or city,or a high school or college classmate.Therefore,the Hardy-Weinberg equilibrium does not apply well to human populations because

Accepted Answer

One of the requirements of Hardy-Weinberg Equilibrium is that mating be random. Any selection of mate will lead to a change in allele frequencies based on the character that lead to the choice of that mate. Nonrandom mating occurs when individuals pair up, not by chance, but according to their genotypes or phenotypes. Inbreeding, or mating between relatives to a greater extent than by chance, is an example of nonrandom mating. Inbreeding decreases the proportion of heterozygotes and increases the proportions of homozygotes at all gene loci. In a human population, inbreeding increases the frequency of recessive abnormalities.Bloom's

Question 7

All the members of a single species that occupy a particular area and are able to interbreed are a

Accepted Answer

A population is a group of organisms of the same species that live in close enough contact to be able to exchange genetic information through breeding. This will keep the group of organisms genetically similar.Bloom's

Question 8

Which statement is NOT true about the founder effect?

Accepted Answer

A bottleneck occurs when a random occurrence reduces a large population to a small one. The founder effect is seen when a small number of individuals establish a new population. Both of these are forms of genetic drift, random changes in allele frequencies by chance. If a population is very large, changes in allele frequencies due to chance alone are insignificant. In small populations these same changes can have profound effects on the overall genetic makeup of the population. It can even lead to the complete loss of one or more alleles or to a more frequent occurrence of rare alleles.Bloom's

Question 9

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is

Accepted Answer

A mutation occurs when nucleotides in the organisms DNA are in some way changed and passed on to offspring. This can lead to a new allelic choice in the population and therefore changes the frequency of alleles.Bloom's

Question 10

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

Accepted Answer

The five conditions that must be met for Hardy-Weinberg Equilibrium to be met are; 1) no mutation, 2) random mating, 3) an infinitely large population, 4) a population that is reproductively isolated from other populations of the same species, and 5) all phenotypes must be equally able to survive and reproduce.Bloom's

Question 11

If the Hardy-Weinberg equilibrium is met,what is the net effect?

Accepted Answer

The Hardy-Weinberg principle states that allele frequencies in a gene pool will remain at equilibrium, and so are constant after one generation of random mating in a large, sexually reproducing population as long as certain conditions are met. A population in Hardy-Weinberg equilibrium is not experiencing changes in allele frequencies and is therefore not evolving.Bloom's

Question 12

According to the Hardy-Weinberg equilibrium,in a population in which 1% does NOT have freckles (recessive),what percentage of the next population is likely to NOT have freckles?

Accepted Answer

Since the Hardy-Weinberg equilibrium states that allele frequencies are not changing from one generation to the next if the original frequency is 0.1 or 1% then it must remain at that frequency.Bloom's

Question 13

The raw material for evolutionary change is

Accepted Answer

While all of the processes listed take part in how populations change over time, or evolve, the only one that contributes new alleles to the gene pool is mutation. The others only act on already existing traits.Bloom's

Question 14

When only a few individuals survive unfavorable times,thereby losing the majority of genotypes in the next generation,it is called

Accepted Answer

A bottleneck occurs when a random occurrence reduces a large population to a small one. While the larger original population may contain a variety of different alleles for each trait only those carried by the individuals surviving to make up the new population will be seen in the new gene pool. With this more limited gene pool any random shifts in allele frequencies can change the frequency of one or more alleles.Bloom's

Question 15

The ____ is the total number of alleles of all the gene loci in all the members of a population.

Accepted Answer

The gene pool consists of all of the available genetic information that is available to a population of organisms. In theory, this information can be passed to future generations of offspring of that population. It is customary to describe this gene pool in terms of allele frequencies for the various genes.Bloom's

Question 16

What is the term used to describe the accumulation of small changes in the gene pool of a species over time?

Accepted Answer

Microevolution is defined as a change in the frequency at which an allele is seen in a population. As changes in these frequencies occur, the phenotype of the population changes and over generations the population evolves.Bloom's

Question 17

The equation,p² + 2 pq + q² = 1.0,describes

Accepted Answer

The Hardy-Weinberg equation is p2 + 2pq + q2 = 1, with p representing the frequency of the dominant allele and q representing the frequency of the recessive allele. The frequency of the occurrence of alleles cannot be greater than 100% or 1, therefore p + q = 1.Bloom's

Question 18

The Amish of Lancaster,PA.have a higher frequency of an unusual form of dwarfism than the population at large.This is probably due to

Accepted Answer

The founder effect is seen when a small number of individuals establish a new population. While the larger original population may contain a variety of different alleles for each trait only those carried by the individuals making up the new population will be seen in the new gene pool. With this more limited gene pool any random shifts in allele frequencies can change the frequency of one or more alleles.Bloom's

Question 19

If there is a change in the allele frequency of a gene pool due to chance,primarily in a small population,it is termed

Accepted Answer

Genetic drift is random changes in allele frequencies by chance. If a population is very large, changes in allele frequencies due to chance alone are insignificant. In small populations these same changes can have profound effects on the overall genetic makeup of the population. It can even lead to the complete loss of one or more alleles.Bloom's

Question 20

In comparing the number of differences in amino acids for cytochrome c: between a moth and a rattlesnake there are 31 different amino acids in the sequence,between a moth and a dog there are only 25,and there are 6 differences between a dog and a horse.Therefore,

Accepted Answer

Similarities and differences in amino acid sequences provide additional lines of evidence for the formation of a family tree.Bloom's

Quiz 27: Evolution of Life

If the frequency of the dominant gene is 0.7,what is the frequency of the recessive gene?

Which of the following is true about genetic drift?

Which of the following does NOT reflect(s) the likely presence of a gene mutation(s) ?

A variety of genotypes and phenotypes in a population is useful because it

Social research indicates that a person is most likely to marry someone from the same village or city,or a high school or college classmate.Therefore,the Hardy-Weinberg equilibrium does not apply well to human populations because

All the members of a single species that occupy a particular area and are able to interbreed are a

Which statement is NOT true about the founder effect?

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

If the Hardy-Weinberg equilibrium is met,what is the net effect?

According to the Hardy-Weinberg equilibrium,in a population in which 1% does NOT have freckles (recessive) ,what percentage of the next population is likely to NOT have freckles?

The raw material for evolutionary change is

When only a few individuals survive unfavorable times,thereby losing the majority of genotypes in the next generation,it is called

The ____ is the total number of alleles of all the gene loci in all the members of a population.

What is the term used to describe the accumulation of small changes in the gene pool of a species over time?

The equation,p² + 2 pq + q² = 1.0,describes

The Amish of Lancaster,PA.have a higher frequency of an unusual form of dwarfism than the population at large.This is probably due to

If there is a change in the allele frequency of a gene pool due to chance,primarily in a small population,it is termed

In comparing the number of differences in amino acids for cytochrome c: between a moth and a rattlesnake there are 31 different amino acids in the sequence,between a moth and a dog there are only 25,and there are 6 differences between a dog and a horse.Therefore,

Quiz 27: Evolution of Life

If the frequency of the dominant gene is 0.7,what is the frequency of the recessive gene?

Which of the following is true about genetic drift?

Which of the following does NOT reflect(s) the likely presence of a gene mutation(s) ?

A variety of genotypes and phenotypes in a population is useful because it

Social research indicates that a person is most likely to marry someone from the same village or city,or a high school or college classmate.Therefore,the Hardy-Weinberg equilibrium does not apply well to human populations because

All the members of a single species that occupy a particular area and are able to interbreed are a

Which statement is NOT true about the founder effect?

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

If the Hardy-Weinberg equilibrium is met,what is the net effect?

According to the Hardy-Weinberg equilibrium,in a population in which 1% does NOT have freckles (recessive) ,what percentage of the next population is likely to NOT have freckles?

The raw material for evolutionary change is

When only a few individuals survive unfavorable times,thereby losing the majority of genotypes in the next generation,it is called

The ____ is the total number of alleles of all the gene loci in all the members of a population.

What is the term used to describe the accumulation of small changes in the gene pool of a species over time?

The equation,p2 + 2 pq + q2 = 1.0,describes

The Amish of Lancaster,PA.have a higher frequency of an unusual form of dwarfism than the population at large.This is probably due to

If there is a change in the allele frequency of a gene pool due to chance,primarily in a small population,it is termed

In comparing the number of differences in amino acids for cytochrome c: between a moth and a rattlesnake there are 31 different amino acids in the sequence,between a moth and a dog there are only 25,and there are 6 differences between a dog and a horse.Therefore,

The equation,p² + 2 pq + q² = 1.0,describes