25. There are two alleles B and b in a population. If the frequency of the B all

Question

25.    There are two alleles B and b in a population. If the frequency of the B allele is 0.75 then the expected number of Bb heterozygotes in a generation consisting of 10,000 individuals under the Hardy-Weinberg equilibrium model would be a) 3750 b) 5625 c) 625 d) 8750 e) 7500.

26.    The main usefulness of the Hardy-Weinberg equilibrium is a model in studying evolutionary change in a population is a) it predicts the change in allele frequency over time due to selection can be used as a null hypothesis in a statistical test of whether significant change has occurred b) it provides a prediction of no evolutionary change over time, which can be used as a null hypothesis in a statistical test of whether significant change has occurred c) it predicts the change in allele frequency over time due to genetic drift d) a & b e) a, b, & c.

27.    If the fitnesses of genotypes AA, Aa, and aa in a population are 10, 15 and 20 respectively, then over time a) the A allele will increase in frequency due to genetic drift b) the A allele will increase in frequency due to selection c) the a allele will increase in frequency due to selection

         d) mutation favors the A allele and will cause it to increase in frequency.

28.    You have two populations, population 1 maintains a constant size of 250 individuals from generation to generation, population 2 maintains a constant size of 5000 individuals from generation to generation. Which of the following would be true about the affects of genetic drift in these populations a) it would occur in population 1 but not in population 2 b) it would occur in population 2 but not in population 1

         c) it would occur in both populations, but cause more rapid change in population 2   d) it would not affect either population e) it would occur in both populations, but cause more rapid change in population 1

29. The theory of uniformitarianism stated that most of the geological features of the earth   a) have been uniform since the earth formed b) remain uniform and unchanged for many hundreds of millions of years c) have been formed by the action of the same geological forces acting today d) have been formed by very powerful forces that no longer act today.

30.    Mutation a) is the most important cause of genetic drift from generation to generation b) generates genetic variation in populations c) is an important force changing allele frequencies from one generation to the next d) a & b e) b & c

31.    The most important mechanism which produces genetic drift is a) taking a finite sample of gametes from the gene pool b) individuals of different genotypes having different fitnesses c) individuals of one population moving to another population and mating at random d) random mutations

Explanation / Answer

25-option a -3750

Note -Bb = 2pq

=2x0.75x0.25

= 0.375

In 10000= 0.375x10000

= 3750

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