Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 1CS
Gender is someone’s conscious and unconscious feelings of belonging to one sex or another. Each year, about 1 in 4500 children are born with a disorder involving sexual development, where the chromosomal, gonadal, or anatomical sex is atypical. Here we will consider two similar cases with different outcomes. In case 1, a 2-year-old child displayed a mosaic chromosome composition of 45, X/46, XY, with one ovary, one testis, a uterus, and ambiguous genitalia. In case 2, a fetus was diagnosed with a mosaic chromosome composition of 46, XX/47, XXY, and after birth, also displayed one testis, one ovary, a uterus, and ambiguous genitalia. The child in case 1 was adopted from an orphanage and raised as a girl. After consultation with the medical team, the parents decided to continue raising the child as a girl and requested surgery that would completely feminize the child. In case 2, the parents decided to forego treatment and let the child make the choice about gender later in life and to remain neutral about the child’s present condition. These cases raise questions about sex determination and the ethics of sex and gender assignment.
In humans, what is the role of the MSY region of the Y chromosome in sex determination and gender development?
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Gender is someone’s conscious and unconscious feelings ofbelonging to one sex or another. Each year, about 1 in 4500children are born with a disorder involving sexual development,where the chromosomal, gonadal, or anatomical sex isatypical. Here we will consider two similar cases with different outcomes.In case 1, a 2-year-old child displayed a mosaic chromosomecomposition of 45,X/46,XY, with one ovary, one testis, a uterus, andambiguous genitalia. In case 2, a fetus was diagnosed with a mosaicchromosome composition of 46,XX/47,XXY, and after birth, also displayedone testis, one ovary, a uterus, and ambiguous genitalia. Thechild in case 1 was adopted from an orphanage and raised as a girl.After consultation with the medical team, the parents decided tocontinue raising the child as a girl and requested surgery that wouldassign the child female sex characteristics. In case 2, the parentsdecided to forego treatment and let the child make the choice aboutgender later in life and to remain…
Proband
Sex-linked
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Arabic numerals
Heterosis
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III
III
E
III
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Depict the birth order in a generation of offspring.
The first time the condition being studied is
recorded but not necessarily the first time the
condition has occurred.
Unusual vigor or increased function of an organism
in a heterozygous state.
Genes located on a sex chromosome result in
sexually dependent inheritance of certain traits.
Placed around a gender symbol such as a circle or
square or diamond to indicate adoption.
Open in Reading V
A couple gives birth to a healthy baby girl. As the girl grows and develops, they
later find out she has Turner's Syndrome. Instead of having the genotype XX (the
normal genotype for females) she is missing an X chromosome. This is
determined based on the symptoms of developing no secondary sexual
characteristics, and a karyotype confirming the missing X chromosomes. The
family is trying to understand the cause. Which of the following choices below
provides the best explanation for how the girl got Turner's Syndrome? *
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Chapter 7 Solutions
Concepts of Genetics (12th Edition)
Ch. 7 - Campomelic dysplasia (CMD1) is a congenital human...Ch. 7 - Carbon Copy (CC), the first car produced from a...Ch. 7 - Gender is someones conscious and unconscious...Ch. 7 - Gender is someones conscious and unconscious...Ch. 7 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 7 - Review the Chapter Concepts list on p. 151. These...Ch. 7 - Distinguish between the concepts of sexual...Ch. 7 - Contrast the XX/XY and XX/X0 modes of sex...Ch. 7 - Describe the major difference between sex...Ch. 7 - How do mammals, including humans, solve the dosage...
Ch. 7 - The phenotype of an early-stage human embryo is...Ch. 7 - What specific observations (evidence) support the...Ch. 7 - Describe how nondisjunction in human female...Ch. 7 - An insect species is discovered in which the...Ch. 7 - When cows have twin calves of unlike sex...Ch. 7 - An attached-X female fly, XXY (see the Insights...Ch. 7 - Assume that on rare occasions the attached X...Ch. 7 - It has been suggested that any male-determining...Ch. 7 - What is a Barr body, and where is it found in a...Ch. 7 - Indicate the expected number of Barr bodies in...Ch. 7 - Define the Lyon hypothesis.Ch. 7 - Can the Lyon hypothesis be tested in a human...Ch. 7 - Predict the potential effect of the Lyon...Ch. 7 - Cat breeders are aware that kittens expressing the...Ch. 7 - In mice, the Sry gene (see Section 7.2) is located...Ch. 7 - The genes encoding the red-and...Ch. 7 - What is the role of the enzyme aromatase in sexual...Ch. 7 - In the wasp Bracon hebetor, a form of...Ch. 7 - The Amami spiny rat (Tokudaia osimensis) lacks a Y...Ch. 7 - In mice, the X-linked dominant mutation Testicular...Ch. 7 - When the cloned cat Carbon Copy (CC) was born (see...Ch. 7 - In reptiles, sex determination was thought to be...Ch. 7 - In chickens, a key gene involved in sex...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A homozygous mother has retinoblastoma, a dominant sex-linked disorder carried on the X chromosome. The father does not have this disorder. What is the chance they will have a child with this disorder? 1) 0% 2) 25% 3) 50% 4) 75% 5) 100% 身arrow_forwardAn individual with XY chromosomes produces gametes where 50% have an extra sex chromosome and 50% have no sex chromosomes. Given this information, what is the probability a fertilized egg will have the genotype XO? Assume that the egg has the expected 23 chromosomes prior to fertilization. 1/3 1/2 1/8 1/4 It is not 1/3 or 1/4arrow_forwardIn a germline cell of genotype Ff Qq where genes F and Q are on different chromosomes, capital and lowercase letters represent alternate alleles (versions or variants) of each gene. If this cell undergoes normal meiosis to produce sperm, what are the possible sperm genotypes? FQ, fq, Fq, fQ Ff, Qq, FQ, fq, Fq, fQ O Ff, Ff, Qq, Qq O F, f, Q, qarrow_forward
- A female has a family history of Duchenne muscular dystrophy, a recessive sex- linked condition that is carried on the X chromosome. She does not have the disease. Her brother, sister, and father all have the disease. while her mother does not. She recently married a male with no family history of the disease. If they decide to have children, what percentage of their sons will have the disease? * 0 0% 0 25% O 50% 0 100%arrow_forwardA human is discovered to have a sex chromosome karyotype of XXY. What phenotypic sex would this individual be and how many Barr bodies would be present in somatic cells. Group of answer choices male: one male: two female; none hermaphrodite; one female; onearrow_forwardA husband and wife have normal vision, although both of the couple's fathers are red-green color-blind, an inherited X-linked recessive condition. What is the probability that the couple's first child will be a normal son? Enter your answer as a fraction or a whole number. Hint: Remember, humans determine sex via the XX = female, XY = male system. Think about the probability of having either a son or a daughter and the probability of having red - green color blindness.arrow_forward
- Usually, if a gene that affects a particular genetic trait is NOT located on a sex chromosome, then consequently (click all that apply) it is an autosomal gene. a diploid cell should have at least two copies of this gene during G1 phase. this gene will be absent from the genomes of gametes. this trait should appear with roughly equal frequency in males and females. this trait must be “dominant.”arrow_forwardMen have XY (or YX) chromosomes and women have XX chromosomes. X-linked recessive genetic diseases (such as juvenile retinoschisis) occur when there is a defective X chromosome that occurs without a paired X chromosome that is not defective. Represent a defective X chromosome with lowercase x, so a child with the xY or Yx pair of chromosomes will have the disease and a child with XX or XY or YX or xX or Xx will not have the disease. Each parent contributes one of the chromosomes to the child. Complete parts a through d below. a. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a son will inherit the disease? nothing (Type an integer or a decimal. Do not round.) b. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a daughter will inherit the disease? nothing (Type an integer or a decimal. Do not round.) c. If a mother has one defective x…arrow_forwardSickle-cell disease is an inherited chronic blood disease caused by an autosomal recessive allele. Suppose a man with sickle-cell disease fathers a child by a woman who is a carrier for sickle-cell disease. What are the chances their children will get the disease? O percent 25 percent 50 percent 75 percentarrow_forward
- Fill in the cells below showing the NORMAL process of meiosis of the male's sex chromosomes (XY – the X and Y are representing the entire chromosome, and remember X and Y act like a homologous pair). DO NOT show crossing over. prior to meiosis 44 +XY What are the possible normal gametes produce after meiosis division? Identify the possible sex of the offspring if these normal sperm cells are fertilized by the egg cell.arrow_forwardA mother and father have four children; two sons and two daughters. What is the probability that the brothers share the same Y chromosome? 100% 25% 50% 0%arrow_forwardOcular albinism is a sex-linked recessive disease carried on the X chromosome. A female carrier mates with a male with this disorder. What percentage of all of their children is predicted to be an albino female? 1) 0% 2) 25% 3) 50% 4) 75% 5) 100%arrow_forward
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