EBK CONCEPTS OF GENETICS
12th Edition
ISBN: 9780134818979
Author: Killian
Publisher: YUZU
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Chapter 23, Problem 4PDQ
Nuclei from almost any source may be injected into Xenopus oocytes. Studies have shown that these nuclei remain active in transcription and translation. How can such an experimental system be useful in developmental genetic studies?
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For a haploid fungus, the starting point in the biosynthesis of the amino acid
arginine is Compound X, which is always present in and absorbed from the
environment. The arginine biosynthetic pathway is:
Enzyme A
Enzyme B
Enzyme Ç
Compound X
It is know that genes encoding enzymes A and C are on two different
chromosomes.
Compound Y
Compound Z-
Arginine
A mutant strain of genotype a (lacking only enzyme A) is crossed to a mutant strain
of genotype c (lacking only enzyme C) to generate a diploid strain. Sporulation (i.e.
meiosis) is subsequently induced in the resulting diploid strain. What proportion of
the spores (haploids formed by sporulation) is expected to grow on medium without
arginine but supplemented with Compound Y?
O 100%
50%
0%
25%
A 20-year-old primigravida gives birth to an infant. The infant had immediate respiratory distress after birth. Newborn examination shows micromelic
limb shortening, frontal bossing and a small chest cavity. A radiograph shows normal bone density without fractures. Which of the following gene
mutations is most likely seen in this patient?
Answers A-E
A CA2
B CLCN7
C COL1A1
D FGFR3
E SQSTM1
In the past, the IOC has employed two genetic sex-
determination tests. The Barr body test screens for
the presence of two X chromosomes. In XX somatic
cells, one copy of the X chromosome condenses into
a largely inactive structure called a
Barr body, which can be seen using a light
microscope. In more recent years, a polymerase
chain reaction-based screen has been used to
amplify the DNA sequence of the SRY gene, which is
found only on the Y chromosome.
Based on their karyotypes, what would be the
outcome of these two tests for each of the four
individuals? Drag the labels to indicate the presence
or absence of a Barr body and the SRY gene
sequence.
Chapter 23 Solutions
EBK CONCEPTS OF GENETICS
Ch. 23 - Suppose you initiate a screen for maternal-effect...Ch. 23 - Prob. 2NSTCh. 23 - Prob. 1CSCh. 23 - Prob. 2CSCh. 23 - Prob. 1PDQCh. 23 - Prob. 2PDQCh. 23 - Prob. 3PDQCh. 23 - Nuclei from almost any source may be injected into...Ch. 23 - Distinguish between the syncytial blastoderm stage...Ch. 23 - Prob. 6PDQ
Ch. 23 - Prob. 7PDQCh. 23 - List the main classes of zygotic genes. What is...Ch. 23 - Experiments have shown that any nuclei placed in...Ch. 23 - Prob. 10PDQCh. 23 - Prob. 11PDQCh. 23 - Prob. 12PDQCh. 23 - Prob. 13PDQCh. 23 - Prob. 14PDQCh. 23 - Prob. 15PDQCh. 23 - Prob. 16PDQCh. 23 - Prob. 17PDQCh. 23 - A number of genes that control expression of Hox...Ch. 23 - The apterous gene in Drosophila encodes a protein...Ch. 23 - In Arabidopsis, flower development is controlled...Ch. 23 - Prob. 21ESPCh. 23 - Prob. 22ESPCh. 23 - Much of what we know about gene interactions in...Ch. 23 - Dominguez et al. (2004) suggest that by studying...
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