Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 47, Problem 9TYU
Summary Introduction

To review:

The existence of the pheromones on the basis of the data provided in the question.

Introduction:

The regular natural changes that occur in the reproductive system of women, specifically in the ovaries and uterus, are referred to as menstrual cycle. These events are necessary for the pregnancy to occur in women.

The graph given in the problem provides the data on the date of onset of the menstrual cycle of a group of women. The y-axis of the graph represents the mean difference between the onset of a particular woman’s menstrual cycle and the average onset date of the rest of the women, while the x-axis represents the time period.

Biological Science, Chapter 47, Problem 9TYU

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You aim to test the hypothesis that the Tbx4 and Tbx5 genes inhibit each other's expression during limb development. With access to chicken embryos and viruses capable of overexpressing Tbx4 and Tbx5, describe an experiment to investigate whether these genes suppress each other's expression in the limb buds. What results would you expect if they do repress each other? What results would you expect if they do not repress each other?
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