BIOLOGY FULL TEXT W/MASTERING BIO MOD
10th Edition
ISBN: 9781323042380
Author: Campbell
Publisher: PEARSON
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Chapter 15.4, Problem 1CC
Summary Introduction
To determine: The reason for occurrence of Down syndrome in a child if chromosomal translocation occurs in gonads of the child’s parents, involving attachment of third copy of chromosome 21 to chromosome 14.
Concept introduction:
Down syndrome is caused by chromosomal aberration in which trisomy of chromosome 21 occurs. The parents of the children with Down syndrome are normal.
Chromosomal translocation is a process in which a part of chromosome does not break during meiosis and is carried to the gamete as it is.
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Two phenotypically normal parents produce a phenotypically abnormal child in which chromosome 5 is missing part of its long arm but has a piece of chromosome 7 attached to it. The child also has one normal copy of chromosome 5 and two normal copies of chromosome 7. With regard to chromosomes 5 and 7, what do you think are the chromosomal compositions of the parents?
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Chapter 15 Solutions
BIOLOGY FULL TEXT W/MASTERING BIO MOD
Ch. 15.1 - Which one of Mendel's laws describes the...Ch. 15.1 - MAKE CONNECTIONS Review the description of...Ch. 15.1 - WHAT IF? Propose a possible reason that the first...Ch. 15.2 - A white-eyed female Drosophila is mated with a...Ch. 15.2 - Neither Tim nor Rhoda has Duchenne muscular...Ch. 15.2 - MAKE CONNECTIONS Consider what you learned about...Ch. 15.3 - When two genes are located on the same chromosome,...Ch. 15.3 - VISUAL SKILLS For each type of offspring of the...Ch. 15.3 - Prob. 3CCCh. 15.4 - Prob. 1CC
Ch. 15.4 - Prob. 2CCCh. 15.4 - Prob. 3CCCh. 15.5 - Gene dosagethe number of copies of a gene that are...Ch. 15.5 - Reciprocal crosses between two primrose varieties,...Ch. 15.5 - WHAT IF? Mitochondrial genes are critical to the...Ch. 15 - What characteristic of the sex chromosomes allowed...Ch. 15 - Why are males affected by X-Iinked disorders much...Ch. 15 - Why are specific alleles of two distant genes more...Ch. 15 - Prob. 15.4CRCh. 15 - Explain how genomic imprinting and inheritance of...Ch. 15 - A man with hemophilia (a recessive, sex-linked...Ch. 15 - Pseudohypertrophic muscular dystrophy is an...Ch. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - A planet is inhabited by creatures that reproduce...Ch. 15 - Using the information from problem 4, scientists...Ch. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - Assume that genes, A and B are on the same...Ch. 15 - Two genes of a flower, one Controlling blue (B)...Ch. 15 - You design Drosophila crosses to provide...Ch. 15 - Banana plants, which are triploid, are seedless...Ch. 15 - EVOLUTION CONNECTION Crossing over is thought to...Ch. 15 - SCIENTIFIC INQUIRY DRAW IT Assume you are mapping...Ch. 15 - WRITE ABOUT A THEME: INFORMATION The continuity of...Ch. 15 - SYNTHESIZE YOUR KNOWLEDGE Butter flies have an X-Y...
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- Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?arrow_forwardVariations in Chromosome NumberAneuploidy Describe the process of nondisjunction and explain when it takes place during cell division.arrow_forwardA phenotypically normal boy has 45 chromosomes, but his sister, who has Down syndrome, has 46. Suggest an explanation that explains both children.arrow_forward
- What is a balanced chromosomal rearrangement?arrow_forward. With regards to the grasshopper testes experiment, diakinesis is an ideal stage to determine chromosome number due to the degree of condensation of the chromosomes? Count the chromosomes at this stage. Does it represent a diploid or a haploid number?arrow_forwarddescribe a specific example of chromosome abnormality that leads to human cancers, such as leukemia, other than the Philadelphia chromosome that is derived from the translocation of chromosome 9 and 22arrow_forward
- Why are the X and Y chromosomes not considered homologous even though they recombine at the PAR region?arrow_forwardExplain why a person with Klinefelter Syndrome (XXY) still exhibits abnormal phenotypes despite the fact that one of the extra X Chromosome is inactivated practically leaving an XY active sex chromosomes similar to a normal male?arrow_forwardWhen a single recombination event occurs between a normal chromosome and a chromosome with a paracentric inversion and within the inverted region, what are the expected meiotic products?arrow_forward
- Two phenotypically unaffected parents produce two children with familial Down syndrome. Regarding chromosome 14 and 21, what are the chromosomal composition of the parents?arrow_forwardWhy are people with balanced chromosomal translocations phenotypically normal? Do they suffer from reduced fertility? Why?arrow_forwardTrisomy 21 is a genetic disorder that occurs when a patient has three copies of chromosome 21 in each cell. Which mutation would MOST likely result in a similar phenotype as trisomy 21?arrow_forward
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