AnswersGA-GSE Biology AUnit Test

Unit Test — Unit test Answers

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In the F2 generation of Mendel’s crosses,

A
all plants had the dominant trait.
B
half of the plants had the dominant allele.
C
all plants had both the dominant and recessive alleles.
D
one in four plants had two alleles for the recessive trait.
23
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Why are scientists concerned about the use of the Bt toxin, which is used to kill insects, in genetic engineering?

A
The Bt toxin is killing too many insects.
B
The Bt toxin stays in the soil for long periods of time.
C
The Bt toxin gene is not readily accepted by plants.
D
The Bt toxin has been known to cause disease in plants.
24

Which most directly describes a benefit of using DNA technology in medicine?

A
Medicine can be produced in mass quantities.
B
Medicine can be distributed at a reduced cost.
C
Medicines have fewer side effects.
D
Medicines are resistant to antibiotics.
25

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma?

A
a recessive trait that requires multiple recessive alleles to be expressed
B
a polygenic trait that is influenced by the alleles of several genes
C
a codominant trait that is expressed more often when more dominant alleles are present
D
a dominant trait that depends on the presence of only one of many dominant alleles
26

Which type of scientific statement is defined as a hypothesis or group of hypotheses that can be accepted as true based on repeated experimentation with similar results?

A
hypothesis
B
theory
C
law
D
probability
27

Which Punnett square represents a cross between two parents that are heterozygous for purple flowers?

A
A Punnett square is shown. The columns are labeled Upper F and f. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F f, Upper F f, f f.
Option A
B
A Punnett square is shown. The columns are labeled f and f. The rows are labeled f and f. Clockwise from upper left the boxes contain: f f, f f, f f, f f.
Option B
C
A Punnett square is shown. The columns are labeled Upper F and Upper F. The rows are labeled Upper F and Upper F. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F Upper F, Upper F Upper F, Upper F Upper F.
Option C
D
A Punnett square is shown. The columns are labeled Upper F and Upper F. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F Upper F, Upper F f, Upper F f.
Option D
28

Scientists have genetically engineered potato plants to produce potatoes that contain edible vaccines. Which is a disadvantage of the genetically engineered potatoes?

A
They are easier to transport and store than injectable vaccines (shots).
B
They make it easier to administer edible vaccines.
C
They are more expensive than potatoes without the vaccine.
D
They have nutritional value while potatoes without the vaccine do not.
29

In a dihybrid cross for round and yellow seeds (RrYy x RrYy), what is the probability of having green and wrinkled seeds?Key: R = round r = wrinkled Y = yellow y = green

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

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