Biology: Life on Earth (11th Edition)
Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134168296
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 31, Problem 3MC
Summary Introduction

Introduction:

Human interference in the biodiversity is the main reason for increasing species extinction. From fossil records, it can be estimated that earlier extinctions occurred naturally. The rate of extinction was very low million years ago. This is known as background extinction rate and it was about 0.1–1 extinction per million species per year. Evidence of mass extinctions is also found in many species million years ago. Recent rate of species extinction is increasing very rapidly. It is about 100–1000 extinctions per million per year and it is 1000 times more than the background extinction rate.

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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…
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