Chapter 15 Test, Biology 7e, Campbell

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Biology, 7e (Campbell)
Chapter 15: The Chromosomal Basis of Inheritance

Chapter Questions

1) Chromosomes and genes share all of the following characteristics except that A) they are both present in pairs in all diploid cells.
B) they both undergo segregation during meiosis.
C) their copy numbers in the cell decrease after meiosis, and increase during fertilization. D) they are both copied during the S phase of the cell cycle. E) they both pair up with their homologues during prophase of mitosis. Answer: E

Topic: Concept 15.1
Skill: Knowledge

2) The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because A) it revealed new and unanticipated features of Mendel's pea plant varieties. B) it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. C) it allowed scientists to see the DNA present within chromosomes. D) it led to the discovery of mitochondria.

E) All of the above are true.
Answer: B
Topic: Concept 15.1
Skill: Comprehension

3) When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? A) The involved gene was on the X chromosome.

B) The involved gene was on the Y chromosome.
C) The involved gene was on an autosome.
D) Other male-specific factors influence eye color in flies. E) Other female-specific factors influence eye color in flies. Answer: A
Topic: Concept 15.1
Skill: Knowledge

4) Which of the following statements is (are) true?
A) The closer two genes are on a chromosome, the higher the probability that a crossover will occur between them. B) The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 50%. C) Two of the traits that Mendel studied-seed color and flower color-are linked on the same chromosome. D) Only B and C are correct.

E) A, B, and C are correct.
Answer: D
Topic: Concept 15.2
Skill: Knowledge

5) How would one explain a testcross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced? A) The two genes are linked.
B) The two genes are unlinked.
C) Recombination did not occur in the cell during meiosis.
D) The testcross was improperly performed.
E) Both of the characters are controlled by more than one gene. Answer: A
Topic: Concept 15.2
Skill: Comprehension

6) New combinations of linked genes are due to which of the following? A) nondisjunction
B) crossing over
C) independent assortment
D) mixing of sperm and egg
E) both A and C
Answer: B
Topic: Concept 15.2
Skill: Comprehension

7) What does a frequency of recombination of 50% indicate? A) The two genes likely are located on different chromosomes. B) All of the offspring have combinations of traits that match one of the two parents. C) The genes are located on sex chromosomes.

D) Abnormal meiosis has occurred.
E) Independent assortment is hindered.
Answer: A
Topic: Concept 15.2
Skill: Comprehension

The following questions refer to the data below and to Figures 15.1 and 15.2.

CROSS I. Purebred lines of wild-type fruit flies (gray body and normal wings) are mated to flies with black bodies and vestigial wings.

Figure 15.1

F1 offspring all have a normal phenotype.

Figure 15.2

CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).

Resulting OffspringNormalPercentage
Gray body; normal wings57525.1
Black body; vestigial wings57124.9
Black body; normal wings57725.2
Gray body; vestigial wings56824.8

A.CROSS I results give evidence supporting the statement.
B.CROSS I results give evidence against the statement.
C.CROSS II results give evidence...
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