AnswersFL-2000310-Biology 1Unit Test

Unit Test — Unit test Answers

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1
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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–
2
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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
3

Red-green color blindness is an X-linked recessive disorder. What is the probability of the offspring having red-green color blindness for the cross that is represented by the Punnett square?

Question illustration
A
0 percent
B
25 percent
C
50 percent
D
75 percent
4

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
5

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
6

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
7

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
8

The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.What is the phenotypic ratio of the offspring?

Question illustration
A
1:1:1:1:2:2:2:2:4
B
1:3:3:9
C
1:4
D
4:12
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

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.
11

A cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. What proportion of the offspring from the second cross will be purple?

A
1 in 4
B
2 in 4
C
3 in 4
D
4 in 4
12

Parents with the genotypes AO and AB have a child. What are all the possible blood types of the child?

A
A, B
B
O, AB
C
A, AB, B
D
O, AB, A
13

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.
14

Error

Answer not available
15

Mendel was able to study seven traits in all the pea plants in each generation. Which of his hypotheses allowed him to analyze each trait separately?

A
If two different alleles for a gene occur together, one of the alleles may be expressed while the other is hidden.
B
When gametes are formed, each gamete carries only one allele for the gene.
C
There are alternate versions of a alleles called genes.
D
For each inherited trait, there is only one copy of the gene that codes for that trait.
16

A cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. What proportion of the offspring from the second cross will be purple?

A
1 in 4
B
2 in 4
C
3 in 4
D
4 in 4
17

Error

Answer not available
18

Error

Answer not available
19

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.
20

Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. Who has hemophilia in the pedigree that is shown?

Question illustration
A
John and Ann
B
Fred and Luke
C
John, Charles, Jack, and Irene
D
Ann and Marie

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