Human Biology: Concepts and Current Issues (8th Edition)
Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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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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In mammals, sperm contribute the usual haploid genome, a centriole, and a micro RNA for Bcl2.  What would be the likely result if this micro RNA did not enter the egg at fertilization? a. This micro RNA is not that important and the embryo would be fine. b. The embryo would not be able to hatch. c. The embryo would not form an orgagnizer. d. The two pronuclei would not be able to replicate their DNA and begin making an embryo.
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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