Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 3, Problem 26PDQ
Summary Introduction
To analyze:
a. Dominant or recessive in each mutation in the given data.
b. Define gene symbols and genotypes of parents from the given data.
| Cross | Number of progeny | ||||
| Straight wings-long bristles | Straight wings-short bristles | Curled wings-long bristles | Curled wings-short bristles | ||
| 1. | Straight-short X straight-short | 30 | 90 | 10 | 30 |
| 2. | Straight-long X straight-long | 120 | 0 | 40 | 0 |
| 3. | Curled-long X straight-short | 40 | 40 | 40 | 40 |
| 4. | Straight-short X straight-short | 40 | 120 | 0 | 0 |
| 5. | Curled-short X straight-short | 20 | 60 | 20 | 60 |
Introduction:
Drosophila is used for the study of molecular and genetic functions since decades. in the given study, mutant type is crossed with wild type to obtain various combinations. Wild type characters of Drosophila are straight wings and long bristles, and mutant type characters are curled wings, and short bristles.
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Students have asked these similar questions
Question GROUP A: Genetics Problems
In humans, red-green color blindness is caused by a recessive allele on the X chromosome. A
male with normal vision and his color-blind wife have a child. If the child is male what is the
probability that he will be color-blind?
The female in the previous problem has a daughter that is color-blind. The husband claims that
this cannot be his child. Can you support or refute his argument?
Question:-
3. Wild type Drosophila has red eyes and gray body*. Autosomal recessive mutations sepia (se) and ebony (e) modify the eye and body color, respectively. What kind of a cross (or crosses) can you set up to determine whether the two genes are linked? You have several lines to choose from: a pure-breeding wild type line (where alleles for both, sepia and ebony are wild type), a double homozygous recessive line, a pure breeding sepia mutant line and a pure breeding ebony mutant line. You don’t have to use all of them.
(a) Write down the cross (or crosses, if necessary) which will allow you to determine linkage; include genotypes of both crossed individuals
(b) What kind of results (offspring) do you expect if the two genes are linked?
(c) What kind of results (offspring) do you expect if the two genes are not linked?
For (b) and (c), state the phenotypes, genotypes and numbers.
Question 4. Recalling the eye pigment pathway in Drosophila, match the following fly genotypes
with the appropriate phenotypes
(w=white, bw-brown, cn=cinnabar red, st=scarlet red, se=sepia brown)
a.
b.
d.
W
W
W
W
;
;
;
;
bw +
bw +
+ cn
bw +
Genotype A
+ cn
bw cn
bw cn
Genotype B
Genotype C
+ cn
Genotype D
;
;
;
;
st+
st se
st se
+ se
st se
+ se
st se
+ se
Scarlet
Sepia
Sepia
White
<
<
<
Chapter 3 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 3 -
CASE STUDY | To test or not to test
Thomas...Ch. 3 -
CASE STUDY | To test or not to test
Thomas...Ch. 3 - CASE STUDY | To test or not to test Thomas first...Ch. 3 -
CASE STUDY | To test or not to test
Thomas...Ch. 3 - When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...
Ch. 3 - When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 -
When working out genetics problems in this and...Ch. 3 - When working out genetics problems in this and...Ch. 3 - Prob. 26PDQCh. 3 -
When working out genetics problems in this and...
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