AGN 115 exam 2 questions well
answered graded A+
southern corn leaf blight...
a. destroyed almost all of the corn crop from Virginia to Texas
b. destroyed almost all of the corn crop in Illinois and Indiana
c. only damaged a few corn varieties because we learned our lesson from the Irish potato
famine
d. both a and b
e. both b and c - correct answer ✔✔b. destroyed almost of the corn crop in illinois and indiana
T/F: while the crop production industry has narrowed its genetic basis over time, the livestock
industry, which relies more on cross-breeding, has maintained a high level of diversity - correct
answer ✔✔false
the observed expression, the interaction between genetics and the environment, is called...
a. phenotype
b. genotype
c. ecotype
d. none of the answers given are correct
e. alphatype - correct answer ✔✔a. phenotype
if you were to cross inbred parental lines (mother TT, father tt), ___ out of 4 of the offspring
would have the dominant (T) trait..
a. 1
b. 2
, c. 3
d. 4
e. none - correct answer ✔✔d. 4
wild crop plant ancestors normally have _____ than domesticated crop plants...
a. more uniform timing of fruit or seed maturity
b. seed "heads" less likely to shatter
c. lower plant "investment" in defensive compounds and structures
d. greater resistance to a wider range of weather conditions - correct answer ✔✔d. greater
resistance to a wider range of weather conditions
all of the following are true of polyploid crops EXCEPT...
a. a polyploid plant possesses more than two complete sets of chromosomes
b. polyploidy is relatively rare in nature, being due to an error in cell reproduction
c. polyploidy in plants is generally associated with larger fruits and seeds
d. the wheat used to make bread is a hexaploid crop - correct answer ✔✔b. polyploidy is
relatively rare in nature
T/F: in a mass-selected crop variety each individual plant contains all the genetic diversity of the
variety. in other words, each individual crop will be genetically uniform within the entire
population of the variety - correct answer ✔✔false
T/F: Bt corn is highly toxic to humans and insects because of how it binds to and breaks down
the gut (intestinal) walls - correct answer ✔✔false
golden rice uses genes from which plant to increase vitamin A nutrition?
a. dandelions
b. corn
answered graded A+
southern corn leaf blight...
a. destroyed almost all of the corn crop from Virginia to Texas
b. destroyed almost all of the corn crop in Illinois and Indiana
c. only damaged a few corn varieties because we learned our lesson from the Irish potato
famine
d. both a and b
e. both b and c - correct answer ✔✔b. destroyed almost of the corn crop in illinois and indiana
T/F: while the crop production industry has narrowed its genetic basis over time, the livestock
industry, which relies more on cross-breeding, has maintained a high level of diversity - correct
answer ✔✔false
the observed expression, the interaction between genetics and the environment, is called...
a. phenotype
b. genotype
c. ecotype
d. none of the answers given are correct
e. alphatype - correct answer ✔✔a. phenotype
if you were to cross inbred parental lines (mother TT, father tt), ___ out of 4 of the offspring
would have the dominant (T) trait..
a. 1
b. 2
, c. 3
d. 4
e. none - correct answer ✔✔d. 4
wild crop plant ancestors normally have _____ than domesticated crop plants...
a. more uniform timing of fruit or seed maturity
b. seed "heads" less likely to shatter
c. lower plant "investment" in defensive compounds and structures
d. greater resistance to a wider range of weather conditions - correct answer ✔✔d. greater
resistance to a wider range of weather conditions
all of the following are true of polyploid crops EXCEPT...
a. a polyploid plant possesses more than two complete sets of chromosomes
b. polyploidy is relatively rare in nature, being due to an error in cell reproduction
c. polyploidy in plants is generally associated with larger fruits and seeds
d. the wheat used to make bread is a hexaploid crop - correct answer ✔✔b. polyploidy is
relatively rare in nature
T/F: in a mass-selected crop variety each individual plant contains all the genetic diversity of the
variety. in other words, each individual crop will be genetically uniform within the entire
population of the variety - correct answer ✔✔false
T/F: Bt corn is highly toxic to humans and insects because of how it binds to and breaks down
the gut (intestinal) walls - correct answer ✔✔false
golden rice uses genes from which plant to increase vitamin A nutrition?
a. dandelions
b. corn
