Chapter 9

Question 1

Half of the yield gains in cereal crops is due to genetic improvement.

Answer 1

True

Question 2

Strict cross-pollinators do not require an outside source of pollen.

Answer 2

False

Question 3

Yield is an example of a quantitative trait.

Answer 3

True

Question 4

Flower color is an example of a quantitative trait.

Answer 4

False

Question 5

Pease are an example of a cross-pollinating species.

Answer 5

False

Question 6

The resulting phenotypic ratio of the cross of two heterozygotes would be 3:1

Answer 6

True

Question 7

A genotype of GG would be homozygous.

Answer 7

True

Question 8

Lodging resistance is an example of a harvestability trait.

Answer 8

True

Question 9

Persistence is a trait that would most often be improved in annuals.

Answer 9

False

Question 10

Plant breeding strategies do not depend on pollination systems.

Answer 10

False

Question 11

High amounts of genetic variation in germplasm are desired at the start of a breeding program.

Answer 11

True

Question 12

The USDA is not currently conducting plant explorations.

Answer 12

False

Question 13

Cross-pollinated species tend to be more uniform than self-pollinated species.

Answer 13

False

Question 14

Hybridization is generally a better technique than mass selection for cross-pollinated species.

Answer 14

True

Question 15

Agrobacterium tumefaciens can transmit its DNA to other cells.

Answer 15

True

Question 16

In 2007, the majority of cotton, alfalfa, and corn planted was genetically modified.

Answer 16

False

Question 17

It is possible to transfer a single gene using traditional breeding methods.

Answer 17

False

Question 18

The maximum number of genetic traits that can be transferred it a single cultivar is four.

Answer 18

False

Question 19

Most modern crop varieties are patented to protect the intellectual property of those who developed them.

Answer 19

True

Question 20

When pollen is transferred to the stigma of the same flower, it is:

Answer 20

self-pollination

Question 21

DNA is organized into units called:

Answer 21

genes

Question 22

Plants that have two copies of each chromosomes are:

Answer 22

diploids

Question 23

The total genetic makeup of a plant is known as its:

Answer 23

genotype

Question 24

The term that describes a group of genetically similar plants that can be distinguished from other groups within the same species is:

Answer 24

cultivar

Question 25

Which of the following is NOT an example of a harvestability trait?

A. increased leafiness
B. uniformity of maturity
C. lodging resistance
D. shatter resistance

Answer 25

A. increased leafiness

Question 26

The development of a new cultivar averages how many years?

Answer 26

5 years

Question 27

The advancement of which of the following crops is considered America’s greatest achievement?

A. soybean
B. wheat
C. barley
D. corn

Answer 27

D. corn

Question 28

Which of the following crops have had their genome sequenced?

A. rice
B. sorghum
C. oats
D. buckwheat

Answer 28

A. rice

Question 29

How are transgenic plants generated once genes have been transferred into cells using biotechnology?

Answer 29

by tissue culture

Question 30

What is the most prevalent trait that has been incorporated into transgenic crops?

Answer 30

herbicide resistance

Question 31

Saving seed that is patented and then growing or selling it is called:

Answer 31

seed piracy