AnswersNC-Biology CR 2024Consequences of DNA Technology

Consequences of DNA Technology — Unit test Answers

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Pedigrees help geneticists understand how traits are inherited between generations. Red-green color blindness is a sex-linked disorder that is determined by a recessive allele on the X chromosome.If Brian has a son who is color-blind, what is known about the genotype of the son's mother?

Question illustration
A
She must have at least one allele for color blindness.
B
She must have two alleles for color blindness.
C
She cannot be homozygous recessive for the gene for color blindness.
D
She cannot be a heterozygous carrier of the gene for color blindness.
2
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DDT was widely used as a pesticide for 20 years. Its use was banned after studies showed severe side effects were evident in humans, the environment, and animals as a result of DDT. Which reason best explains why the side effects of DDT were so harmful?

A
DDT kills insects and other pests.
B
DDT decomposes.
C
DDT was genetically engineered.
D
DDT bioaccumulates.
3

Corn can be injected with herbicide-tolerant recombinant DNA. Which type of organism is herbicide-tolerant corn?

A
infertile organism
B
purebred organism
C
transgenic organism
D
recombinant organism
4

A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds?Key: R = round r = wrinkled Y = yellow y = green

A
1:16
B
3:16
C
8:16
D
9:16
5

The diagram illustrates the process of developing genetically modified corn.What occurs at step 4 in the diagram?

Question illustration
A
The foreign DNA is placed in a mechanical vector for cloning.
B
The foreign DNA is placed in a biological vector for cloning.
C
The foreign DNA is inserted into the host cell genome.
D
The foreign DNA is isolated by restriction enzymes.
6

In some cases, recombinant DNA must be cloned before it can be inserted into a host. Which vectors can be used to clone recombinant DNA?

A
phages and plasmids
B
gene guns and micropipettes
C
restriction enzymes
D
transgenic bacteria
7

Which are different forms of the same gene?

A
genotypes
B
phenotypes
C
alleles
D
traits
8

Which best describes biotechnology?

A
the process of analyzing DNA samples to identify individuals involved in criminal activities
B
DNA made by connecting fragments of DNA with desired traits from different DNA sources
C
the field of biology that uses genetic engineering to produce crops, pharmaceuticals, and enzymes for use in industry and manufacturing
D
the process of cutting DNA into fragments and inserting the fragments with a desired gene into another organism
9

A company has many genetically engineered poplar trees around its factories. Which best describes the poplar trees?

A
They are being used for phytoremediation.
B
They have transferred their genes to a nontarget species.
C
They have reduced the effectiveness of pesticides.
D
They are being used for disease resistance.
10

Which is an application of DNA technology in medicine?

A
mapping human genes for manipulation
B
determining specific traits that a baby will have before its conception
C
producing disease resistant humans
D
determining hereditary diseases in individuals and families
11

Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?

A
O+
B
A+
C
AB+
D
AB–
12

While genetic modification of food has numerous advantages, some people are concerned about the potential of genetically modified crops to

A
add vitamin and mineral supplements to food.
B
target harmless insects unintentionally.
C
help clean up pollution in contaminated soil.
D
resist extreme temperature changes.
13

Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type of dominance is exhibited by the offspring?

A
complete dominance
B
blended dominance
C
codominance
D
incomplete dominance
14

Mendel’s pea plants had either purple or white flowers. This means that the plants

A
can self-pollinate.
B
have two recessive traits.
C
have two alleles for the gene.
D
have two copies of a gene from one parent.
15

Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

A
The child cannot have the disease because only the dominant alleles will be passed on.
B
The child will have the disease because only recessive alleles will be passed on.
C
The child may or may not have the disease because a recessive gene from each parent may be passed on.
D
The child may or may not have the disease because the disease does not depend on the alleles of the parents.

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