Part II – Mendelian Genetics

Subject GENETICS

Topic     Part II – Mendelian Genetics

Type      Questions-Answers

Level     High School

Style      APA

Sources                2

Language             English(U.S.)

Description

This is the only part that you need to answer!

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 rst veri ed 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 di erence between sexes, Snyder grouped families by the phenotypes of the parents, disregarding the gender of each parent, and tabulated his data (Snyder, 1931a):

NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE

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

0

17

Questions

1. What kind of evidence would indicate that the ability to taste PTC is inherited?
2. Why was it important for Snyder to verify that males and females had similar proportions of tasters and non- tasters?
3. Why do couples who can taste PTC have children who cannot?
4. What is the signi cance of the fact that couples who cannot taste PTC never have children who can?
5. Based on these data, what can you conclude about PTC taste blindness? What is your evidence?
6. e second parent-phenotype combination would appear to represent a group of testcrosses. What ratios are expected from testcrosses and what does each ratio represent? ese data donвЂTMt seem to t either of these expected ratios. How can you explain this?

Reference

Snyder, L. H. 1931a. Inherited taste de ciency. Science 74: 151–152.

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