HUMAN HEREDITY (LL)-W/MINDTAP ACCESS
11th Edition
ISBN: 9781305717022
Author: Cummings
Publisher: CENGAGE L
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Chapter 17, Problem 2CS
The Joneses were referred to a clinical geneticist because their 6-month-old daughter was failing to grow adequately and was having recurrent infections. The geneticist took a detailed family history (which was uninformative) and a medical history of their daughter. He discovered that their daughter had a history of a constant cough and wheeze that was becoming progressively worse, had difficulty gaining weight (failure to thrive), and had an extensive history of yeast infection (thrush) in her mouth. The geneticist did a simple blood test to check their daughter’s white blood count and determined that she had severe combined immunodeficiency (SCID).
The geneticist explained that SCID is an immune deficiency that causes a marked susceptibility to infections. The defining characteristic is usually a severe defect in both the T- and B-lymphocyte systems. This results in one or more infections within the first few months of life that are serious and may even be life-threatening. Based on the family history, it was possible that their daughter had inherited a mutant allele from each of them and therefore was homozygous for a gene that causes SCID. If so, each time the Joneses had a child, there would be a 25% chance that the child would have SCID. Prenatal testing is available to determine whether the developing fetus has SCID.
If the Joneses want to be certain that their next child will not have SCID, what types of reproductive options do you think they have?
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After you feel comfortable with your counting method and identifying cells in the various stages of mitosis, use the four images below of whitefish blastula to count the cells in each stage until you reach 100 total cells, recording your data below in Data Table 1. (You may not need to use all four images. Stop counting when you reach 100 total cells.)
After totaling the cells in each stage, calculate the percent of cells in each stage. (Divide total of stage by overall total of 100 and then multiply by 100 to obtain percentage.)
Data Table 1Stage Totals PercentInterphase Mitosis: Prophase Metaphase Anaphase Telophase Cytokinesis Totals 100 100%
To find the length of time whitefish blastula cells spend in each stage, multiply the percent (recorded as a decimal, in other words take the percent number and divide by 100) by 24 hours. (Example: If percent is 20%, then Time in Hours = .2 * 24 = 4.8) Record your data in Data…
Chapter 17 Solutions
HUMAN HEREDITY (LL)-W/MINDTAP ACCESS
Ch. 17.8 - One treatment for peanut allergies is to give an...Ch. 17.8 - Prob. 2EGCh. 17 - Prob. 1CSCh. 17 - The Joneses were referred to a clinical geneticist...Ch. 17 - The Inflammatory Response Is a General a. What...Ch. 17 - The Complement System Kills Microorganisms The...Ch. 17 - The Adaptive Immune Response Is a Specific Defense...Ch. 17 - Prob. 4QPCh. 17 - The Adaptive Immune Response Is a Specific Defense...Ch. 17 - Prob. 6QP
Ch. 17 - Prob. 7QPCh. 17 - The Adaptive Immune Response Is a Specific Defense...Ch. 17 - Prob. 9QPCh. 17 - The Adaptive Immune Response Is a Specific Defense...Ch. 17 - It is often helpful to draw a complicated pathway...Ch. 17 - The Adaptive Immune Response Is a Specific Defense...Ch. 17 - The Adaptive Immune Response Is a Specific Defense...Ch. 17 - Prob. 14QPCh. 17 - Prob. 15QPCh. 17 - Blood Types Are Determined by Cell-Surface...Ch. 17 - Prob. 17QPCh. 17 - Blood Types Are Determined by Cell-Surface...Ch. 17 - Prob. 19QPCh. 17 - Prob. 20QPCh. 17 - Prob. 21QPCh. 17 - Organ Transplants Must Be Immunologically A burn...Ch. 17 - Organ Transplants Must Be Immunologically In the...Ch. 17 - Organ Transplants Must Be Immunologically In the...Ch. 17 - Organ Transplants Must Be Immunologically A couple...Ch. 17 - Prob. 26QPCh. 17 - Disorders of the Immune System Antihistamines are...Ch. 17 - Disorders of the Immune System Autoimmune...Ch. 17 - Prob. 29QPCh. 17 - Prob. 30QPCh. 17 - Prob. 31QP
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