You have a population of mice that you are breeding in the lab. There are 132 mice in the population. 48 of them are

white, a recessive trait.

What is the frequency of the recessive allele?

48/132 = .36√.36 = .6

You have a population of mice that you are breeding in the lab. There are 132 mice in the population. 48 of them are

white, a recessive trait.

What is the frequency of the homozygous dominant genotype?

q = .6p = 1-.6 = .4P2 = .16

You have a population of mice that you are breeding in the lab. There are 132 mice in the population. 48 of them are

white, a recessive trait.

What is the frequency of the heterozygous genotype?

2pq = 2 x .4 x .62pq = .48

After graduation, you and 24 friends build a raft, sail to a deserted island, and start a new population, totally isolated from the world. One of your friends carries (is heterozygous

for) the recessive cf allele, which in homozygotes causes cystic fibrosis.

Assuming that the frequency of this allele does not change as the population grows,

what will be the instance of cystic fibrosis on your island?

25 people.One person carries cf.

49 alleles are dominant, 1 allele is recessive.

q = 1/50 = .02p = 49/50 = .98

q2 = .02 x .02 = .0004 (or .04%)

If 9% of an African population is born with a severe form of sickle-cell anemia (ss),

what percentage of the population will be more resistant to malaria because they are heterozygous(Ss) for the sickle-cell

gene?q2 = .09q = .3p = .7

2pq = 2 x .7 x .3 = .42

Wing coloration of the scarlet tiger moth is controlled by a single gene in an incomplete dominance pattern.

Data was collected for 1612 individuals.White-spotted (AA) =1469

Intermediate (Aa) = 138 Little spotting (aa) =5

Calculate the following frequencies for this population:

A = a =

AA = Aa = aa =

Wing coloration of the scarlet tiger moth is controlled by a single gene in an incomplete dominance pattern.

Data was collected for 1612 individuals.White-spotted (AA) =1469

Intermediate (Aa) = 138 Little spotting (aa) =5

Calculate the following frequencies for this population:

A = 3076/3224 = .954a = 148/3224 = .046

AA = 1469/1612 = .911Aa = 138/1612 = .085

aa = 5/1612 =.003

57 high school students at Coral Shores were surveyed to see if they could taste the chemical

PTC. 14 of them could not.What are the allele frequencies

in the population?q2 = 14/57 = .25q = .5p = .5

57 high school students at Coral Shores were surveyed to see if they could taste the chemical

PTC. 14 of them could not.What are the genotype

frequencies in the population?q2 = .252pq = .5p2 = .25

57 high school students at Coral Shores were surveyed to see if they could taste the chemical PTC. 14 of

them could not.

If the surveyed students are representative of the population, how many of the 743 students at

the school would you expect will be able to taste PTC?

If the surveyed students are representative of the

population, how many of the 743 students at the school

would you expect will be able to taste PTC?

.75 x 743 = 557

If a specific, recessive allele is selected against, what would you expect to see in the allele

frequencies over several generations?

q would decreasep would increase

If a specific, recessive allele is selected against, would you

expect that allele to be lost from the population?

No. Carriers would pass the allele to subsequent generations.

If a specific, dominant allele is selected against, what would you expect to see in the allele

frequencies over several generations?

p would decreaseq would increase

If a specific, dominant allele is selected against, would you

expect that allele to be lost from the population?

Yes. There are no carriers. The allele may be eliminated over time.

If there is an advantage to being heterozygous, what effect

would this have on the allele frequencies of the population?

q would be higher than if there was no benefit to being heterozygous

How would immigration and emigration effect the allele

frequencies of an established population?

It would change the frequencies of the alleles in the gene pool. Equilibrium would eventually be reestablished, but the frequencies would probably be different.

How does selective mating effect the allele frequencies

within a population?

The frequency of the selected FOR allele would increase.The frequency of the selected AGAINST allele would decrease.

If a population is small and isolated, what might you expect to see in the allele frequencies?

Random chance may cause a shift in frequencies. Either allele could become more prominent.

What is this process called?

Genetic Drift

What is natural selection?

What is artificial selection?

What animals are currently undergoing artificial selection?

What are some of the side-effects of artificial selection?