Genetics: A Conceptual Approach
Genetics: A Conceptual Approach
6th Edition
ISBN: 9781319050962
Author: Benjamin A. Pierce
Publisher: W. H. Freeman
Question
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Chapter 10.3, Problem 29AQP

a.

Summary Introduction

To determine:

The ratio of A+GT+C and ratio ofA+TC+Gfor the organisms given in the table.

Introduction: Erwin Chargaff discovered some rules that help to explain the double helix structure of DNA. He is the first to identify that the number of guanine is equal to number of cytosine, and number of adenine is equal to number of thymine. He also stated that the amount of nitrogenous bases alters in different species.

a.

Expert Solution
Check Mark

Explanation of Solution

Organism and tissueA+GT+CA+TC+G
Sheep thymus29.3+21.428.3+21.0=50.749.3=1.0229.3+28.321.0+21.4=57.642.4=1.36
Pig liver29.4+20.529.7+20.5=49.950.2=0.9929.4+29.720.5+20.5=59.141.0=1.44
Human thymus30.9+19.929.4+19.8=50.849.2=1.0330.9+29.720.5+20.5=60.641.0=1.48
Rat bone marrow28.6+21.428.4+20.4=50.048.8=1.0228.6+28.420.4+21.4=57.041.8=1.36
Hen erythrocytes28.8+20.529.2+21.5=49.350.7=0.9728.8+29.221.5+20.5=58.042.0=1.38
Yeast31.7+18.332.6+17.4=50.050.0=1.0031.7+32.617.4+18.3=64.335.7=1.80
E.coli26.0+24.923.9+25.2=50.949.1=1.0326.0+23.925.2+24.9=49.950.1=0.99
Human sperm30.9+19.131.6+18.4=50.050.0=1.0030.9+31.618.4+19.1=62.537.5=1.67
Salmon sperm29.7+20.829.1+20.4=50.549.5=1.0229.7+29.120.4+20.8=58.841.2=1.42
Herring sperm27.8+22.127.5+20.7=49.948.2=1.0427.8+27.520.7+22.1=55.342.8=1.29

b.

Summary Introduction

To determine:

Whether the ratios are constant among the organisms or they vary.

b.

Expert Solution
Check Mark

Explanation of Solution

A+GT+CRatio among all the organisms is almost constant as the value ranges around 1.0, this concludes that the DNA is double stranded in these organisms. A+TC+GRatio is not constant, as the percentage of GC base pair and AT base pair are varying with the organism so it suggests that all the organisms belongs to different species.

c.

Summary Introduction

To explain:

Whether A+GT+C is different for samples of sperm, to explain with reason.

c.

Expert Solution
Check Mark

Explanation of Solution

A+GT+CRatio will remain same for the samples of sperms because the percentage of pyrimidine and purines must be equal in the case of double stranded DNA.

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