Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
12th Edition
ISBN: 9780134605203
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Chapter 39, Problem 1CA
During a 3-month period, acute hepatitis B virus (HBV) infection was diagnosed in 9 residents of a nursing home. Serological testing of all residents revealed that 9 people had acute HBV infection, 2 had chronic infection, 5 had antibodies to HBV, and 58 were susceptible. Medical charts of residents were reviewed for history of medications and use of ancillary medical services. Infection control practices at the nursing home were assessed through interviews with personnel and direct observations of nursing procedures. A summary of the medical charts is shown below.
*A case patient has hepatitis B.
Susceptible residents live in the nursing home but do not have hepatitis B.
- What is the usual method of transmission for hepatitis B?
- What is the probable source of infection in hospitals?
- How was this infection transmitted?
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10. Consider the following enzyme and its substrate where the "+" and "-" indicate cations and
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Substrate
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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 12
LESSON
2
Applying Mendel's Principles
READING TOOL Connect to Visuals Before you read, preview Figure 12-7. Try to infer the
purpose of this diagram. As you read, compare your inference to the text. After you read, revise
your statement if needed or write a new one about the diagram's purpose. Take notes on the lines
provided. Then view the Punnett square and answer the questions below regarding the genotypes
and phenotypes.
Inference:
Revision:
Parent 2
rryy
Gametes
F
ry
Parent 1
RRYY
Gametes
RY
RrYy
The F, generation are all RrYy.
1. What is the phenotype of
parent 1?.
2. What is the genotype of parent 1?
3. What is the phenotype of parent 2?
4. What is the genotype of parent 2?
5. What is the phenotype of the F, offspring?.
6. What is the genotype of the F, offspring?.
7. What kind of cross does this figure describe?
144
Chanter 12 Introduction to Genetice
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Chapter 39 Solutions
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
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