Please answer number 6Questions:What kind of evidence would indicate that the ability to taste PTC is inherited?Why was it important for Snyder to verify that males and females had similar proportions of tasters and non-tasters?Why do couples who can taste PTC have children who cannot?What is the significance of the fact that couples who cannot taste PTC never have children who can?Based on these data, what can you conclude about PTC taste blindness? What is your evidence?The second parent-phenotype combination would appear to represent a group of test crosses. What ratios are expected from test crosses and what does each ratio represent? These data don’t seem to fit either of these expected ratios. How can you explain this? NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCETo the Bitter End: A Case Examining theGenetics of PTC SensitivitybyR. Deborah OverathDepartment of Life SciencesTexas A&M University – Corpus ChristiPart II – Mendelian GeneticsAfter obtaining some PTC from Arthur Fox, L.H. Snyder determined the PTC phenotype (can taste or cannottaste) for the members of 100 nuclear families. He first verified that gender was not a factor by comparingthe number of male tasters and non-tasters to the number of female tasters and non-tasters. Because therewas essentially no difference between sexes, Snyder grouped families by the phenotypes of the parents,disregarding the gender of each parent, and tabulated his data (Snyder, 2015a).Phenotypes of ChildrenParent-Phenotype CombinationsNo. of familiesCan tasteCannot tasteBoth parents can taste409016One parent can taste,the other cannot518037Neither parent can taste917

Introduction: The physical appearance of an organism such as colour, height, which occurs as a…

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Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations

Section: Chapter Questions

Problem 17QP

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Please answer number 6

Questions:

What kind of evidence would indicate that the ability to taste PTC is inherited?
Why was it important for Snyder to verify that males and females had similar proportions of tasters and non-tasters?
Why do couples who can taste PTC have children who cannot?
What is the significance of the fact that couples who cannot taste PTC never have children who can?
Based on these data, what can you conclude about PTC taste blindness? What is your evidence?
The second parent-phenotype combination would appear to represent a group of test crosses. What ratios are expected from test crosses and what does each ratio represent? These data don’t seem to fit either of these expected ratios. How can you explain this?

NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE
To the Bitter End: A Case Examining the
Genetics of PTC Sensitivity
by
R. Deborah Overath
Department of Life Sciences
Texas A&M University – Corpus Christi
Part II – Mendelian Genetics
After obtaining some PTC from Arthur Fox, L.H. Snyder determined the PTC phenotype (can taste or cannot
taste) for the members of 100 nuclear families. He first verified that gender was not a factor by comparing
the number of male tasters and non-tasters to the number of female tasters and non-tasters. Because there
was essentially no difference between sexes, Snyder grouped families by the phenotypes of the parents,
disregarding the gender of each parent, and tabulated his data (Snyder, 2015a).
Phenotypes of Children
Parent-Phenotype Combinations
No. of families
Can taste
Cannot taste
Both parents can taste
40
90
16
One parent can taste,
the other cannot
51
80
37
Neither parent can taste
9
17

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