GENETICS:FROM GENES TO GENOMES(LL)-PKG
6th Edition
ISBN: 9781260377033
Author: HARTWELL
Publisher: MCG
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Chapter 6, Problem 33P
From a cross between e f g and e f g strains of Neurospora, recombination between these linked genes resulted in a few octads containing the following ordered set of spores:
e+ f+ g+
e+ f+ g+
e+ f- g+
e+ f- g+
e- f- g-
e- f- g-
e- f- g-
e- f- g-
| a. Where was recombination initiated? |
| b. Did crossing-over occur between genes e and g? Explain. |
| c. Why do you end up with 2 f+:6 f− but 4 e+: 4 e− and 4g+: 4g−? |
| d. Could you characterize these unusual octads as MI or MII for any of the three genes involved? Explain. |
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Your goal is to produce black seeds resistant to mold. So you make the same cross again (between a homozygous black seeded, mold susceptible parent and a homozygous white seeded and mold resistant parent), and, again, advance progeny by SSD to create 100 F10 generation plants.
Based on the information you obtained from your first crossing experiment (Question #4), how many F10 plants would you expect to have black seeds and be resistant to mold?
Assume that a toxin produced by the mold fungus has been isolated. Only mold resistant seeds will germinate in the presence of the toxin. Could you use this toxin screening procedure to have segregation distortion work in your favor in the F2 generation? Explain your answer.
Info from Question 4
a. P Locus (Seed Color):
Hypothesis: The null hypothesis (H₀) is that seed color is controlled by alleles at a single locus.
Observed Data:
Total white seeds: 45 (resistant plants) + 6 (susceptible plants) = 51
Total black seeds: 7 (resistant…
10. Consider the following enzyme and its substrate where the "+" and "-" indicate cations and
anions, respectively. Explain which of the following inhibitors could inhibit this enzyme?
Which type of inhibitor would it be and why? (Video 5-2)
Substrate
Enzyme
Potential inhibitors
Using Punnett Squares Punnett squares are one good
way to predict the outcome of genetic crosses. Punnett
squares use mathematical probability to help predict the
genotype and phenotype combinations in genetic crosses. The
number of possible alleles from each parent determines the
number of rows and columns in the Punnett square.
Independent Assortment
KEY QUESTION How do alleles segregate when more than
one gene is involved?
Mendel wondered if the segregation of one pair of alleles
affects another pair. For example, does the gene that
determines the shape of a seed affect the gene for seed color?
This type of experiment is known as a two-factor, or dihybrid,
cross because it involves two different genes. Single-gene
crosses are monohybrid crosses.
Visual Reading Tool: Two-Factor Cross: F₂
The Punnett square shows the
results of self-crossing the F,
generation of a cross between
round yellow peas and wrinkled
green peas.
1. List the different genotypes in
the F, generation. What is the…
Chapter 6 Solutions
GENETICS:FROM GENES TO GENOMES(LL)-PKG
Ch. 6 - Griffith, in his 1928 experiments, demonstrated...Ch. 6 - Griffith, in his 1928 experiments, demonstrated...Ch. 6 - During bacterial transformation, DNA that enters a...Ch. 6 - Nitrogen and carbon are more abundant in proteins...Ch. 6 - If 30 of the bases in human DNA are A, a what...Ch. 6 - Which of the following statements are true about...Ch. 6 - Imagine you have three test tubes containing...Ch. 6 - What information about the structure of DNA was...Ch. 6 - A portion of one DNA strand of the human gene...Ch. 6 - When a double-stranded DNA molecule is exposed to...
Ch. 6 - A particular virus with DNA as its genetic...Ch. 6 - The underlying structure of DNA is very simple,...Ch. 6 - Prob. 13PCh. 6 - Bacterial transformation and bacteriophage...Ch. 6 - The CAP protein is shown bound to DNA in Fig....Ch. 6 - In Meselson and Stahls density shift experiments...Ch. 6 - When Meselson and Stahl grew E. coli in 15N medium...Ch. 6 - If you expose human tissue culture cells for...Ch. 6 - Draw a replication bubble with both replication...Ch. 6 - a. Do any strands of nucleic acid exist in nature...Ch. 6 - As Fig. 6.21 shows, DNA polymerase cleaves the...Ch. 6 - The bases of one of the strands of DNA in a region...Ch. 6 - Replicating structures in DNA can be observed in...Ch. 6 - Indicate the role of each of the following in DNA...Ch. 6 - Draw a diagram of replication that is occurring at...Ch. 6 - Figure 6.18 depicts Watson and Cricks initial...Ch. 6 - Researchers have discovered that during...Ch. 6 - A DNA synthesizer is a machine that uses automated...Ch. 6 - Bacterial cells were coinfected with two types of...Ch. 6 - A yeast strain with a mutant spo11- allele has...Ch. 6 - Imagine that you have done a cross between two...Ch. 6 - The Neurospora octad shown came from a cross...Ch. 6 - From a cross between e f g and e f g strains of...Ch. 6 - In Step 6 of Fig. 6.27, the resolvase enzyme...Ch. 6 - Figure 6.31shows four potential outcomes of...Ch. 6 - Each of the substrates for site-specific...Ch. 6 - Prob. 37PCh. 6 - Suppose that you could inject a wild-type mouse...Ch. 6 - C31 is a type of bacteriophage that infects...Ch. 6 - Cre is a recombinase enzyme encoded by a gene in...Ch. 6 - Like Cre/loxP recombination, site-specific...
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