Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Textbook Question
Chapter 20, Problem 6PDQ
(a) What are zygotic genes, and when are their gene products made? (b) What is the
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If an AaBbCcdd male mates with an AaBbCCDd female:
A) What is the minimum number of ridge-producing genes possible in one of their children?
B) What would the be the TRC for this child if it is a male?
C) If this child is a male, will he have a higher or lower TRC than the parent with the lower ridge count?
D) What is the maximum number of ridge-producing genes possible in a child of this couple?
E) If this child is a female, will she have a higher or lower TRC than the parent with the higher ridge count?
If an AaBbCcdd male mates with an AaBbCCDd female:
A) What is the minimum number of ridge-producing genes possible in one of their children?
B) What would the be the TRC for this child if it is a male?
C) If this child is a male, will he have a higher or lower TRC than the parent with the lower ridge count?
Zygote
Embryo
Muscle cells
Intestinal cells
Liver cells
Blood cells
Nerve cell
Cardiac cells
(1) Specialization occurs, resulting in the
formation of a great variety of cell types.
(2) Genes are inserted into the zygote to
allow for the formation of different cell
types.
(3) The expression of genes responsible for
the different cell types is controlled by the
placenta.
(4) The genetic information in the zygote is
divided to produce a complete set for each
cell type
Chapter 20 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 20 -
CASE STUDY |One foot or another
In humans the...Ch. 20 - CASE STUDY| One foot or another In humans the HOXD...Ch. 20 - CASE STUDY| One foot or another In humans the HOXD...Ch. 20 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 20 - Review the Chapter Concepts list on page 403. Most...Ch. 20 -
3. Nuclei from almost any source may be injected...Ch. 20 -
4. Distinguish between the syncytial blastoderm...Ch. 20 - (a) What are maternal-effect genes? (b) When are...Ch. 20 - (a) What are zygotic genes, and when are their...Ch. 20 - List the main classes of zygotic genes. What is...
Ch. 20 -
8. Experiments have shown that any nuclei placed...Ch. 20 - How can you determine whether a particular gene is...Ch. 20 -
10. You observe that a particular gene is being...Ch. 20 - What are Hox genes? What properties do they have...Ch. 20 -
12. The homeotic mutation Antennapedia causes...Ch. 20 - The Drosophila homeotic mutation spineless...Ch. 20 - A number of genes that control expression of Hox...Ch. 20 - In Arabidopsis, flower development is controlled...Ch. 20 - Prob. 16PDQCh. 20 - Dominguez et al. (2004) suggest that by studying...
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- a) Define Disorders of Sex Development (DSD). b) Explain why gene mutations affecting gonad development may lead to DSD conditions. c) What is sex-chromosome mosaicism? When and how may this mosaicism arise?arrow_forwardWhat genetic criteria distinguish a case of extranuclear inheritance from (a) a case of Mendelian autosomal inheritance; (b) a case of X-linked inheritance?arrow_forwardWhich is NOT true about Downsyndrome: A) The increased risk of Down Syndrome correlates with the number of children in the family and not with maternal age B) Genome editing by turning off the extra chromosome 21 may reveal new ways to treat the syndrome C) Bioethics examines the effect of prenatal diagnosis on the prevalence of people with trisomy 21 Down syndrome D) The chance that trisomy 21 will recur in a family based on empirical data is 1 percentarrow_forward
- What is a A germline mutation?arrow_forwardNow assume that the pedigree shown in question 1 shows the inheritance of a rare genetic disease. a) The disease is most likely autosomal dominant b) The disease is most likely autosomal recessive c) The disease is equally likely to be either autosomal dominant or autosomal recessive, but cannot be x-linked d) Cannot be determined from the information givenarrow_forwarda) Identify and describe 5 different types of genetic inheritance.(b) In humans, glucose-6-phosphate dehydrogenase deficiency is a recessive X-linkedtrait. Describe the inheritance of this disease, including an example of the possibleoutcomes of:(i) An affected mother and an unaffected father having children. (ii) An affected father and a homozygous unaffected mother having childrenarrow_forward
- A particular person is said to be a carrier of a genetic trait. What does this tell you about their phenotype? (a) They physically show the trait. (b) They physically show the trait more than a noncarrier would show the trait.(c) They are almost normal but show an intermediate phenotype for the trait. (d) They are completely normal and do not physically show the trait.arrow_forwardIf a genetic female fetus is exposed to testosterone in utero, would that individual develop a complete male phenotypic sex, partial male phenotypic sex, or a normal female phenotypic sex? Explain your answer, describing the sex phenotype of the gonads, internal genital ducts and external genitalia. What would the developmental outcomes be if the fetus were instead exposed to dihydrotestosterone in utero?arrow_forwardWhich of the following statements is true regarding the inheritance of a human X-linked recessive trait if the mother is a carrier and the father is affected? a) At least one affected individual will be present in every generation b) all sons will be affected c) None of the offspring will be affected d) all daughters will be affected e) on average, half of the daughters will be affected and half of the sons will be affectedarrow_forward
- Because red-green colour-blindness is an X-linked recessive condition, which of the following situations is not possible? a) a colourblind father passes the condition to this daughter b) a colourblind father passes the condition to his son c) a heterozygous mother passes the condition to her daughter d) a heterozygous mother passes the condition to her son Red-green colour blindness is a deficiency of colour vision so that a person affected by it cannot tell the difference between red and green. This is an X-linked recessive condition. Which statement is correct? a) The allele is written as X^r, and an affected female is heterozygous. b) The allele is written as X^r; an affected male is X^rY and a heterozygous female is X^RX^r c)The allele is written as X^r and a male with genotype X^RY is affected d) The allele is written as X^R; a normal male is X^RY and a homozygous recessive female is X^rX^r.arrow_forwardHemophilia is an X-linked recessive disease. A hemophilic man marries a woman who is not a carrier of the disease. (a) Draw a Punnett square showing the genotypes of their children. (b) What are the chances that their daughters will be carriers of the disease? (c) What percentage of their children are likely to have the disease?arrow_forwardWhat is Polygenic Inheritance? A) When one gene has many effects B) The additive effect of 2 or more genes C) The genes that cause skin colorarrow_forward
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