Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 23.3, Problem 2EQ
Summary Introduction
To determine: The entire experimental design for the research study proposed by the researchers Ole Seehausen and Jacques van Alphen with reference to figure 23.9 given in the text book.
Introduction: In 1998, Ole Seehausen and Jacques van Alphen investigated the role of sexual selection because it pertains to the male coloration of two cichlid (tropical fresh water fish) species.
Summary Introduction
To determine: The purpose of conducting experiments under two different light conditions.
Introduction: In 1998, Ole Seehausen and Jacques van Alphen investigated the role of sexual selection because it pertains to the male coloration of two cichlid (tropical fresh water fish) species.
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Required information
Hfr (thr¹, azi, ton", lact, galt, str) and F¯ (thr¯, azi³, ton³, lac¯, ga, str) cells were mated in an interrupted mating
experiment. The results of replica plating the Str' Thr* exconjugants to test for the presence of the other four genes are
shown in the graph.
Percentage of cells with Hfr genetic
markers among Str' Thr* recombinants
100
80
60
40
20
0
17
44
15
20
22
8
0
0
10
Use the graph to match the minutes that correspond to each gene's map position.
gal
ton
azi
azi
ton'
1
10
20
30
40
Minutes prior to interruption of conjugation
lac
lac+
gal+
I
50
90%
85%
40%
20%
!
Required information
Hfr (thrt, azi, ton", lact, galt, str) and F¯ (thr¯, azi³, ton³, lac, ga, str) cells were mated in an interrupted mating
experiment. The results of replica plating the Str Thr* exconjugants to test for the presence of the other four genes are
shown in the graph.
Percentage of cells with Hfr genetic
markers among Str' Thr* recombinants
100
80
60
40
20
0
0
Multiple Choice
I
30
azi'
lac+
gal+
I
10
20
40
Minutes prior to interruption of conjugation
ton'
gene order could not be determined.
I
50
the fraction of cells with each marker would be 100%.
90%
85%
If a sample had been taken at 70 minutes after mating instead of at 1-minute intervals, then
40%
20%
gene order could be determined because the final fraction of exconjugants with a marker decreases as distance from the origin of transfer increases.
gene order could be determined because the final fraction of exconjugants with a marker increases with distance from the origin of transfer.
vivo V20
male or female.
Remember that since most sex-linked traits are recessive, the person wno
shows the trait can have no X's with big superscripted letters. So, y a male
carries the trait, he must also show the trait.
XDY
XDXD
XªY
PXPX
Carrier? (Yes or No)
Has the Trait? (Yes or No)
Male or Female
Phenotype or Appearance
of the Individual
Guided Questions:
1. What chromosomes will result to a normal phenotype (normal spongy pore
trait)?
2. Do all individuals who have the spongy tiny pore allele show it in their physical
appearance? Why or why not?
3. Can males be a carrier of an X-linked recessive trait? How about females?
Explain.
4. What will be the sex of an individual who is easily affected by an X-linked
recessive trait? Why?.
The Y chromosome is missing this section
of the X chromosome. The lower sections
Males are at greater risk for inheriting
Chapter 23 Solutions
Biology
Ch. 23.1 - Prob. 1CSCh. 23.2 - Prob. 1CCCh. 23.2 - Prob. 2CCCh. 23.2 - Prob. 3CCCh. 23.3 - Prob. 1CCCh. 23.3 - Prob. 1EQCh. 23.3 - Prob. 2EQCh. 23.3 - Prob. 3EQCh. 23.4 - Genetic Drift Concept Check: How does the...Ch. 23.4 - Prob. 1CS
Ch. 23.5 - Prob. 1CCCh. 23 - Population geneticists are interested in the...Ch. 23 - The Hardy-Weinberg equation characterizes the...Ch. 23 - Prob. 3TYCh. 23 - Prob. 4TYCh. 23 - Prob. 5TYCh. 23 - Prob. 6TYCh. 23 - Prob. 7TYCh. 23 - Prob. 8TYCh. 23 - Kimuras proposal regarding neutral variation...Ch. 23 - Populations that experience inbreeding may also...Ch. 23 - Prob. 1CQCh. 23 - Prob. 2CQCh. 23 - Prob. 3CQCh. 23 - Antibiotics are commonly used to combat bacterial...Ch. 23 - Discuss die similarities and differences among...
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