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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Chapter 20 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
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- What type of genes regulate the development of anatomical segments and structures in an organism, directing the development of different body regions early in the organism's development? A. Homeotic genes B. Anatomical genes C. Allelic genes D. Methylated genesarrow_forwardWhich gene program is described correctly? A. Cell division is the process whereby identical cells begin to specialize into specific cell types. B. Signal induction identifies important body axes such as anterior-posterior and dorsal-ventral. C. Differentiation increases the number of cells, so an organism can grow larger. D. Morphogenesis is the process whereby cells identify where they are in three-dimensional space.arrow_forwardWhen in fruit fly development does axes development begin? A. in the unfertilized egg stage when maternal effect genes deposit mRNA and proteins in specific locations B. in the early embryo stage when induction signals between neighboring cells identify where the cells are in three-dimensional space C. in the larval stage when body segments appear, and pattern formation is evident D. in the pupal stage when a gradient of morphogens is establishedarrow_forward
- Which observation led Thomas Morgan to realize that the gene for fruit fly eye color was located on a sex chromosome? a. He noticed that only male F2 flies could have white eyes; no females displayed this trait. b. He saw that the F2 generation of flies had the classic 3:1 phenotypic ratio of red eyes to white eyes c. He read it in a biology textbook d. He noticed that only mutant flies had white eyesarrow_forwardWhich is NOT a way that deletions can cause abnormal phenotypes? A. Haploinsufficient genes can result because too much gene product is produced. B. Recessive mutations may be expressed if the wild-type allele is deleted, a phenomenon called pseudodominance. C. If the centromere is deleted, then the whole chromosome could be lost during cell division. D. All of the above 1 pointsarrow_forwardIs this true or false? a. Fertilization is followed by a cleavage, a period of rapid cell division without growth. b. From the process above, this results in the production of a large number of cells called blastomeres. c. In sexual reproduction, the offspring have the same combinations of genes as their parents. d. Sequential hermaphroditism occurs when an animal is one sex during one phase of its lifecycle and the opposite sex during another phasearrow_forward
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