25. Assume the trait for brown eyes is completely dominant to blue eyes and this

Question

25. Assume the trait for brown eyes is completely dominant to blue eyes and this trait is controlled by a single gene. If 400 people in a population of 10,000 have blue eyes, how many people would be expected to be heterozygous for this trait? (Hint: Use the Hardy-Weinberg formula.)

a. 8,000      b. 5,400      c. 3,200       d. 960       e. 320

26. In a Hardy-Weinberg equilibrium, as the frequencies of homozygous genotypes increase, the frequency of the heterozygous genotype _____.

   a. doubles      b. deceases exponentially     c. increases linearly      d. decreases linearly    e. remains the same

27. The Hardy Weinberg conditions for genetic equilibrium include all of the following except

    a. Large population    b. Only random mating    c. No gene flow     d. Must have natural selection    

28. According to the theory of evolution, those gene sets that are best adapted to the environment will _____.

     a. survive and reproduce     b. not survive

     c. produce offspring that are genetically identical to their parents     d. have lower fertility rates

     e. have fewer offspring on average

29. The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell trait is an example of _____.

     a. natural selection    b. genetic drift   c. spontaneous mutational spread    

     d. heterozygote disadvantage    e. the founder effect

Explanation / Answer

25. Assume the trait for brown eyes is completely dominant to blue eyes and this trait is controlled by a single gene.

If 400 people in a population of 10,000 have blue eyes, how many people would be expected to be heterozygous for this trait? (Hint: Use the Hardy-Weinberg formula.)

a. 8,000     

b. 5,400

    c. 3,200 -----------answer  

    d. 960   

   e. 320

according to H.W.E

p^2+2pq +q^2

brown eyes-------- completely dominant

blue eyes----------------------recessive

q^2 =400 / 10000

q^2 =0.04

q=0.2

according to H.W.E

p+q=1

p=1-0.2=0.8

heterozygous for this trait =2pq

=2pq *10000 =2*0.8*0.2 *10000 =3200-------answer

26. In a Hardy-Weinberg equilibrium, as the frequencies of homozygous genotypes increase, the frequency of the heterozygous genotype _____.

   a. doubles

    b. deceases exponentially    

c. increases linearly     

d. decreases linearly----------------answer  

e. remains the same

27. The Hardy Weinberg conditions for genetic equilibrium include all of the following except

    a. Large population   

b. Only random mating ---------------answer   

c. No gene flow   

  d. Must have natural selection    

Hardy Weinberg conditions-ABSENCE OF ALL EVOLUTIONARY FORCES

28. According to the theory of evolution, those gene sets that are best adapted to the environment will _____.

a. survive and reproduce ---------------answer     

  b. not survive

     c. produce offspring that are genetically identical to their parents

    d. have lower fertility rates

     e. have fewer offspring on average

29. The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell trait is an example of _____.

     a. natural selection   

b. genetic drift

  c. spontaneous mutational spread    

     d. heterozygote disadvantage ----ANSWER

   e. the founder effect

AS-------sickle cell trait, --------- protects against malaria in -heterozygotes

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