HUMAN HEREDITY (LL)-W/MINDTAP ACCESS
11th Edition
ISBN: 9781305717022
Author: Cummings
Publisher: CENGAGE L
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Chapter 6, Problem 25QP
Albinism is caused by an autosomal recessive allele of a single gene. An albino child is born to
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In Alaskan Malamute dogs, an autosomal recessive allele
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Cystic fibrosis (CF) is an autosomal recessive condition triggered by the overproduction of sticky
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the afflicted to live through adulthood.
The mother of Claudia died from cystic fibrosis, but her father was normal and never had any
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Claudia: ________________________ Marcus: _____________________
They planned to have four children. What is the probability that:
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PLEASE SHOW COMPLETE SOLUTION
A homozygous recessive allele, aa, is responsible for albinism. Humans can exhibit this phenotype. In each
of the following cases, determine the possible genotypes of the mother and father, and of their children:
(a) Both parents have normal phenotypes; some of their children are albino and others are unaffected:
(b) Both parents are albino and have only albino children:
(c) The woman is unaffected, the man is albino, and they have one albino child and three unaffected children:
at a busy hospital. The son of the first couple has hemophilia, a recessive, X-linked
Two mothers give birth to sor
disease. Neither parent from couple #1 has the disease. The second couple has an unaffected son, despite the fact
that the father has hemophilia. The two couples challenge the hospital in court, claiming their babies must have beer
swapped at birth. You must advise as to whether or not the sons could have been swapped. What would you say?
5. In a dispute over parentage, the mother of a child with…
Chapter 6 Solutions
HUMAN HEREDITY (LL)-W/MINDTAP ACCESS
Ch. 6 - Genetics in Practice case studies are...Ch. 6 - Genetics in Practice case studies are...Ch. 6 - Analyzing Karyotypes 1. Originally, karyotypic...Ch. 6 - Given the karyotype shown at right, is this a male...Ch. 6 - A colleague e-mails you saying that she has...Ch. 6 - What are the two most commonly used methods of...Ch. 6 - Prob. 5QPCh. 6 - Discuss the following sets of terms: a. trisomy...Ch. 6 - What chromosomal abnormality can result from...Ch. 6 - Tetraploidy may result from: a. lack of...
Ch. 6 - A cytology student believes he has identified an...Ch. 6 - An individual is found to have some tetraploid...Ch. 6 - A spermatogonial cell undergoes mitosis before...Ch. 6 - A teratogen is an agent that produces nongenetic...Ch. 6 - As a physician, you deliver a baby with protruding...Ch. 6 - Variations in Chromosome NumberAneuploidy Describe...Ch. 6 - A woman gives birth to monozygotic twins. One boy...Ch. 6 - Assume that a meiotic-nondisjunction event causes...Ch. 6 - Prob. 17QPCh. 6 - What is the genetic basis and phenotype for each...Ch. 6 - The majority of nondisjunction events leading to...Ch. 6 - Prob. 20QPCh. 6 - If all the nondisjunction events leading to Turner...Ch. 6 - Identify the type of chromosomal aberration...Ch. 6 - Describe the chromosomal alterations and phenotype...Ch. 6 - A geneticist discovers that a girl with Down...Ch. 6 - Albinism is caused by an autosomal recessive...Ch. 6 - Fragile-X syndrome causes the most common form of...
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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
- Albinism is caused by an autosomal recessive allele that interferes with skin pigmentation in mammals. Two normally pigmented human parents already have an albino boy. They plan to continue to have children until they get a girl. Some or all of this information is important for each of the questions below. a) What is the probability that their next child (currently unborn) will be a girl with albinism? Explain your reasoning. b) What is the probability their first female child will be albino? Explain your reasoning. c) The answer to part (b) is different (and, yes, the answer is different) from the answer to part (a). Explain why. (Hint: it has something to do with the underlined words.)arrow_forwardTuberous Sclerosis (TS) is an autosomal dominant genetic disease characterized by seizures, mental retardation, autism, and benign tumors of the brain, heart, skin, and kidneys. The kidney tumors can also be malignant. This disease exhibits a wide range of severity, and only about 1/3 of the cases are inherited. Two different genes have been tightly linked to the disease in families where it is inherited. The remaining 2/3 appear to be due to mutations in one of the 2 genes as well. Overall it appears that 1/2 are caused by mutations in TSC1 and the other half by mutations in TSC2. A rat model for hereditary renal carcinoma (kidney cancer) has been found. Southern and Northern blot analysis of the TSC1 and TSC2 gene revealed no differences between these rats and normal rats. Not all the rats in the strain would get cancer but a significant proportion did and those were selected for and used in experiments. 1. a) What was detected by the Southern blots? (look this up, make your…arrow_forwardCystic Fibrosis (CF) is an autosomal recessive condition. Therefore, heterozygous (Cc) carriers do not display symptoms. Two parents who are carriers plan to start a family and you are a genetic counselor helping to advise them about their chances of having children affected by CF. a) Suppose the couple has 4 children, each one year apart. What is the probability that all 4 children will inherit CF? b) What is the probability that any 3 of their 4 children will not inherit CF, but 1 will be affected? c) What is the probability that their first child will not inherit CF, but the younger 3 children will inherit CF?arrow_forward
- Please consider the following pedigree. Assume that people who marry in to the family do not carry the allele unless otherwise indicated. Assume complete penetrance. image attached a. Is it possible for the inheritance pattern for the trait illustrated in this pedigree to be as a result of each of the following? Answer yes or no. (i) an autosomal recessive allele (AR)(ii) an autosomal dominant allele (AD)(iii) a X-linked recessive allele (XR)(iv) a X-linked dominant allele (XD) b. Provide a set of parents that definitively supports your answers in (a).arrow_forwardThe allele for albinism is recessive to the allele for normal skin pigmentation. All individuals who are homozygous for this recessive allele (m) are unable to produce the enzyme needed for melanin production and are referred to as albinos. In the following statements, determine the correct genotypes: An albino male (genotype A) whose parents both have normal skin pigmentation (genotype B) marries a woman who does not have albinism (genotype C). This woman’s father is an albino (genotype D). The married couple has three children, two with normal skin pigmentation (genotype E) and one exhibiting albinism (genotype F)arrow_forwardIn humans, cystic fibrosis and albinism are both inherited as independently assorting autosomal recessive traits. Use f to represent the recessive allele for cystic fibrosis and F for the allele for the unaffected condition. Use A to represent the dominant allele for normal melanin and a for the recessive allele for albinism. A man is albino and heterozygous for cystic fibrosis. His wife has the unaffected phenotype for both traits, although her father had cystic fibrosis and her mother is albino. 4a. What is the genotype of the wife 4b.What is the probability that a child of this couple is albino and has cystic fibrosis? 4c.What is the probability that a child of this couple is a girl who is albino and has cystic fibrosis? 4d.What is the probability that a child of this couple is normal for both traits?arrow_forward
- X‑linked, recessive diseases, such as hemophilia, are extremely rare in the population. However, many women are carriers and show no sign of the disease. The pedigree illustrates the inheritance of an X‑linked, recessive disease. Determine whether the unknown individuals are affected by the disease, unaffected by the disease, or carriers of the X‑linked recessive allele. Unaffected individuals are not carriers of the X‑linked recessive allele.arrow_forwardCystic fibrosis (CF) is an autosomal recessive condition triggered by the overproduction of sticky mucus that clogs the lungs and pancreas. It is a life-threatening disease, but medical advances helped the afflicted to live through adulthood. Betty's mother died from cystic fibrosis, but her father was normal and never had any relative with CF. Her fiancé, Jones, turned out to be a carrier of the CF allele. What are the genotypes of Betty and Jones? 1. Betty: ________________________ 2. Jones: _____________________ They planned to have four children. What is the probability that: 3. all children will be normal 4. at least two will be normalarrow_forwardBelow is a pedigree chart for a family that has a history of Alkaptonuria. Individuals infected with this condition can have darkened skin, brown urine, and can suffer from joint damage and other complications. Given this pedigree answer the following questions. Given the data in the pedigree chart is this genetic condition autosomal dominant or autosomal recessive? What are the genotypes for #1, #2, and #3? If either of the 4th generation "aa" females were to mate with a homozygous dominant male would any of their offspring illustrate the phenotype? Why or why not?arrow_forward
- Please consider the following pedigree. Assume that people who marry in to the family do not carry the allele. Assume complete penetrance. I II III 3 IV 1 2 a. Is it possible for the inheritance pattern for the trait illustrated in this pedigree to be as a result of each of the following? Answer yes or no. (i) an autosomal recessive allele (AR) (ii) an autosomal dominant allele (AD) (iii) a X-linked recessive allele (XR) (iv) a X-linked dominant allele (XD) b. Based strictly on the characteristic patterns of inheritance that define the four different options in (a), give a definitive motivation for the most likely mode of inhertance.arrow_forwardPedigree analysis is often used to determine mode of inheritance (dominant or recessive, for example). Be sure to read the "Tips for Pedigree Analysis" in Figure 14.15 in 34. your text. Consider the following pedigree for the trait albinism (lack of skin pigmentation) in three generations of a family. (Solid symbols represent individuals with albinism.) Complete the unlabeled pedigree by indicating the genotypes for all involved. From your knowledge of Mendelian inheritance, answer the questions that follow. a. Is this trait caused by a dominant or recessive allele? What is the evidence for your response?arrow_forwardPorphyria is a genetic disorder caused by the inability to properly metabolize a component of hemoglobin. King George III is suspected to have been afflicted with this disorder. Assume that both George and his Queen suffered from this disorder and they had one afflicted child and one normal child. Is porphyria inherited in a dominant or recessive fashion? What must be the genotype of both George and his Queen? Using punnett square, show ALL work used to achieve your answer.arrow_forward
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