AnswersFL-2000310-Biology 1 BThe Basis of DNA Technology

The Basis of DNA Technology — Unit test Answers

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There are health concerns surrounding the products that have been genetically engineered for particular traits, including pharmaceuticals, crops, and enzymes that are used in industry and manufacturing processes. Which is a health concern that affects society?

A
patented products
B
bioaccumulation
C
land use
D
cancer
2
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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
3

Which scenario breaks the law of segregation?

A
a gamete contains the father’s allele
B
the gametes produced each have 1 allele after meiosis II
C
a gamete produced has 2 of the same alleles after meiosis II
D
the gamete fertilized has the dominant trait
4

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
5

In roses, red flowers and long stems are dominant traits. A rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. What percentage of the offspring will exhibit red, long-stemmed flowers?

A
25 percent
B
50 percent
C
75 percent
D
100 percent
6

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
7

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.
8

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. Which Punnett square represents the correct way to set up the cross RRYy ´ RrYY?

A
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R y, r Upper Y, r y. The rows are labeled Upper R Upper Y, Upper R y, r Upper y, r y.
Option A
B
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R y, r Upper Y, r y. The rows are labeled Upper R Upper Y, Upper R y, Upper R Upper y, Upper R y.
Option B
C
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R Upper Y, r Upper Y, r Upper Y. The rows are labeled Upper R Upper Y, Upper R y, Upper R Upper Y, Upper R y.
Option C
D
A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R Upper Y, r Upper Y, r Upper Y. The rows are labeled Upper R Upper Y, Upper R Upper Y, Upper R Upper Y, Upper R Upper y.
Option D
9

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

A
A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, Upper D d, Upper D d, Upper D d.
Option A
B
A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, d d, d d, Upper D d.
Option B
C
A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled Upper D and d. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D d, d d, UpperD d.
Option C
D
A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled Upper D and Upper D. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D Upper D, Upper D Upper D, Upper D Upper D.
Option D
10

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.
11

The graph shows the change in the number of Bt and HT crops grown in the United States from 1996 to 2005. Bt crops are resistant to being eaten by insects. HT crops are resistant to herbicides (weed killers). Based on the information in the graph, which is most likely true about farming in 2005?

Question illustration
A
Fewer crops were grown with herbicides.
B
More crops needed to be sprayed with pesticides.
C
Fewer crops were eaten by pests.
D
More crops needed to be sprayed with herbicides.
12

If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?

A
F1 generation only
B
P generation only
C
F1 generation and F2 generation
D
P generation and F2 generation
13

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.

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