postprac2 Flashcards
Hardy-Weinberg Equilibrium genotype frequencies are
Select one:
a. rarely found in nature
b. only achieved under natural selection
c. achieved in one generation under certain conditions
d. p + q = 1
achieved in one generation under certain conditions
Consider a rare genetic disease caused by a recessive mutation. If the frequency of affected people in the population is 0.09, what percent of the population will be heterozygous carriers? Select one: a. 0.3 b. 0.42 c. 0.7 d. 0 .0081
b. 0.42
If we know that a gene is under natural selection and the population is in the process of losing an allele due to homozygote disadvantage then we can conclude that
Select one:
a. evolution cannot occur in this population
b. the individuals in this population must start migrating
c. the population cannot be in Hardy-Weinberg equilibrium
d. the population must be in Hardy-Weinberg equilibrium
c. the population cannot be in Hardy-Weinberg equilibrium
Migration of individuals into a population can upset the equilibrium only if
Select one:
a. the immigrants mate with individuals in the population
b. the immigrants are beyond the age of reproduction
c. the immigrants arrive in large numbers
d. females and males are in equal proportion
the immigrants mate with individuals in the population
If the frequency of a recessive allele in a population that is in equilibrium is 40 percent, then in the next generation the frequency of that allele would be Select one: a. 40 percent b. 80 percent c. 20 percent d. unpredictable
a. 40 percent
Which of the following is an example of random mating?
Select one:
a. The largest and strongest males develop a harem
b. Females birds of paradise select the most colourful males
c. Some males mate with any females they encounter
d. Pollen is distributed by insects to nearby flowers
Some males mate with any females they encounter
A population in equilibrium will produce individuals of the homozygous dominant genotype in the following frequency: Select one: a. p2 + q2 b. q2 c. 2pq d. p2
d. p2
If the allele frequencies for a particular gene are p = 0.4 and q = 0.6, what percent of the population will have the recessive genotype (aa)? Select one: a. 36% b. 16% c. 60% d. 48%
a. 36%
If we reject the hypothesis that a population is in Hardy-Weinberg equilibrium, then one of the following has occurred: Select one: a. speciation b. migration c. replication d. recombination
b. migration
The ABO blood group gene in humans is usually in Hardy-Weinberg equilibrium. This means that
Select one:
a. p = q in this case
b. humans mate randomly with respect to blood type
c. all human genes are in H-W equilibrium
d. no evolution is occurring in the human species
b. humans mate randomly with respect to blood type
If we say a gene is demonstrating a homozygote recessive disadvantage, we mean that
Select one:
a. the recessive allele will eventually be lost
b. the gene has alleles that are more recessive than usual
c. the dominant allele will eventually be lost
d. natural selection cannot occur in this case
a. the recessive allele will eventually be lost
If the allele frequency of a population are known to be p = 0.1 and q = 0.9, then the expected frequency of heterozygotes in the next generation will be Select one: a. 0.81 b. 0.18 c. 0.01 d. 0.09
b. 0.18
A human populations was screened for a blood type gene with two alleles (M and N). The population has the following numbers of each genotype: 38 MM; 101 MN and 41 NN. What are the allele frequencies in this population? Select one: a. p = 0.5, q = 0.5 b. p = 0.4, q = 0.6 c. p = 0.2, q = 08 d. p = 0.1, q = 0.9
a. p = 0.5, q = 0.5
A population of 1000 has the following distribution of genotypes: 320 AA; 335 Aa and 345 aa. Given this information, which of the following statements is true?
Select one:
a. The allele frequency of A (p) = 0.32
b. The a allele seems to be dominant in this case
c. The population is in Hardy Weinberg Equilibrium
d. The expected number of heterozygotes is 500
The expected number of heterozygotes is 500
When a population is in Hardy Weinberg equilibrium
Select one:
a. allele frequencies will not change from one generation to the next
b. individuals will choose mates based on similar phenotypes, resulting in some individuals successfully mating more frequently than other individuals
c. it is common for some individuals to interbreed with individuals from neighbouring populations
allele frequencies will not change from one generation to the next
