Biology 101 Final Exam ESSAY ANSWER SHEET-Q&A
Take as much space as you need to answer each question.
Provide concise answers in your own words. Do not cut and paste from other sources.
(Just type n/a after the number
...
Biology 101 Final Exam ESSAY ANSWER SHEET-Q&A
Take as much space as you need to answer each question.
Provide concise answers in your own words. Do not cut and paste from other sources.
(Just type n/a after the number for the two questions that you do not answer.)
Q: Dihybrid cross. The kernels (seeds) on an ear of corn are all offspring of one set
of parents. There are 2 pairs of alleles on separate homologous chromosomes (purple or
yellow kernels on one pair, plump or shrunken kernels on another). Yellow (Y) is
dominant to purple (y) and plump (P) is dominant to shrunken (p). If the genotype of
parent plants are YyPp and yyPp, what are the expected probabilities of the genotypes
and phenotypes of the offspring kernels? Explain your reasoning.
. Q: A population of grasshoppers in the Kansas prairie has two color phenotypes,
with 90% of the grasshoppers green and 10% brown. Typically in the last century, the
prairie receives adequate rain to maintain healthy green grass, but for the last decade the
prairie suffers a severe drought and is also invaded by a bird that eats grasshoppers.
Briefly explain in terms of the four parts of natural selection listed below how the
population of grasshoppers would be expected to change during the drought years.
Q: Describe an environmental problem that you feel is the most urgent worldwide.
Which areas of the world are suffering the most from the problem? Propose a solution to
the problem.
. Q: Describe three structures found in plant cells but not animal cells. Describe the
function of each structure, and how each benefits plant cells but is not necessary for
animal cells.
64. Q: Explain why top carnivores, such as eagles and tigers, have low population
densities in nature. Include processes of the energy pyramid (trophic levels) in your
answer.
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