Human Biology: Concepts and Current Issues
Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 20, Problem 9TY
Summary Introduction

Introduction:

There are two types of cells in the body, somatic cells and germ cells. The gametes (eggs and sperms) are called as the germs cells and rest of the cells are called the somatic cells. The genes in the somatic cells do not get passed on to the progeny.

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Why is it easier to manipulate embryonic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell?   a. As cells develop, signaling pathways can cause some genes to be turned off during development.   b. Adult cells have different DNA content than do embryonic stem cells.   c. Emybronic stem cells pose less of a threat for organ rejection as do an individual s own adult cells.   d. It is no easier to manipulate emybronic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell.
How can epistasis decrease the number of phenotypes observed in apopulation?a. One gene may mask the expression of another gene.b. One allele may mask the expression of another allele of the samegene.c. Genes may become silenced after exposure to certainenvironmental cues.d. Genes may be inactivated if they are on an X chromosome.
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