AnswersFL-2000310-Biology 1 BUnit Test

Unit Test — Unit test Answers

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21
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A scientist is studying fruit fly wings. Straight wings are dominant, and curly wings are recessive. Which statement correctly describes the F1 generation if a straight-winged parent is crossed with a curly-winged parent and if both parents are true breeding?

A
The offspring will have two genes for straight wings.
B
The offspring will produce only gametes that have genes for curly wings.
C
The offspring will have one allele for straight wings and one allele for curly wings.
D
The offspring will have only one kind of allele for the gene that determines wing type.
22
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Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. What is the probability of having offspring that have wrinkled seeds and yellow seed color for the cross RRYY ´ RrYy?

A
0 percent
B
25 percent
C
50 percent
D
100 percent
23

In peas, yellow seed color (Y) is dominant to green seed color (y). A homozygous green seed pea plant is crossed with a heterozygous yellow seed pea plant. What is the predicted phenotypic ratio of the offspring based on seed color?

A
50 percent yellow, 50 percent green
B
50 percent YY, 50 percent yy
C
100 percent yellow, 0 percent green
D
100 percent Yy, 0 percent yy
24

Which is a potential negative consequence of using genetically engineered medicine?

A
Gene markers that are resistant to antibiotics are used, providing the possibility for humans to have increased antibiotic resistance.
B
Products that are used to genetically engineer medicine are poisonous.
C
Restriction enzymes are used to create the medicine and have been known to cause cancer.
D
Medicine that is created this way is less effective than medicine that is created the traditional way.
25

The process of genetic engineering may include either four or five steps. The diagram represents the five-step process.Which best describes step 2?

Question illustration
A
Restriction enzymes cut the DNA into fragments; the fragments join with the host DNA to create recombinant DNA.
B
Recombinant DNA is inserted into a biological vector; the vector houses the recombinant DNA and can produce copies of DNA for itself and the recombinant DNA.
C
Cloning of the recombinant DNA occurs; the DNA is cloned in the biological vector to create more DNA for use in the host.
D
Recombinant DNA is inserted into a mechanical vector; the mechanical vector allows the DNA to be inserted into the DNA clone for use in the host.

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