Joan was born with six toes on each foot, a dominanttrait called polydactyly. Two of her five siblings and hermother, but not her father, also have extra digits. Whatis Joan’s genotype for the number-of-digits character?Explain your answer. Use D and d to symbolize the allelesfor this character.

Joan was born with six toes on each foot, a dominanttrait called polydactyly. Two of her five siblings and hermother, but not her father, also have extra digits. Whatis Joan’s genotype for the number-of-digits character?Explain your answer. Use D and d to symbolize the allelesfor this character.

Name: Joan was born with six toes on each foot, a dominanttrait called polyd
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Description: Joan was born with six toes on each foot, a dominanttrait called polydactyly. Two of her five siblings and hermother, but not her father, also have extra digits. Whatis Joan’s genotype for the number-of-digits character?Explain your answer. Use D and

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter11: The Basic Principles Of Heredity

Section: Chapter Questions

Problem 9TYU: Mr. and Mrs. Smith are concerned because their own blood types are A and B, respectively, but their...

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In humans, a rare dominant disorder known as nail-patella syndromecauses abnormalities in the fingernails, toenails, and kneecaps.Researchers have examined family pedigrees with regard to thisdisorder and have also examined the blood types of individualswithin each pedigree. (A description of blood genotypes is foundin Chapter 4.) In the following pedigree, individuals affected withnail-patella disorder are shown with filled symbols. The genotypeof each individual with regard to ABO blood type is also shown.Does this pedigree suggest any linkage between the gene thatcauses nail-patella syndrome and the gene that causes blood type?
In a maternity ward, four babies become accidentallymixed up. The ABO types of the four babies are known tobe O, A, B, and AB. The ABO types of the four sets ofparents are determined. Indicate which baby belongs toeach set of parents: (a) AB × O, (b) A × O, (c) A × AB,(d) O × O
Wooly hair is a rare dominant trait found in people of Scandinavian descent in which the hair resembles the wool of a sheep. Amale with wooly hair, who has a mother with straight hair, movesto an island that is inhabited by people who are not of Scandinavian descent. Assuming that no other Scandinavians immigrate tothe island, what is the probability that a great-grandchild of thismale will have wooly hair? (Hint: You may want to draw a pedigree to help you figure this out.) If this wooly-haired male haseight great-grandchildren, what is the probability that one out ofeight will have wooly hair?
Both members of a couple know that they are carriers of the cysticfibrosis allele. None of their three children has cystic fibrosis, but anyone of them might be a carrier. The couple would like to have a fourthchild but are worried that he or she would very likely have the disease,since the first three do not. What would you tell the couple? Would itremove some uncertainty from their prediction if they could find outwhether the three children are carriers?
If I got an A from my father and a O from my mother for my genotype. How would my phenotype be expressed? What is my blood type? Explain your reasoning for both answers.
Karen and Steve each have a sibling with sickle-cell disease.Neither Karen nor Steve nor any of their parents have thedisease, and none of them have been tested to see if they carrythe sickle-cell allele. Based on this incomplete information,calculate the probability that if this couple has a child, thechild will have sickle-cell disease.
Hemochromatosis is an inherited disease caused by arecessive allele. If a woman and her husband, who are bothcarriers, have three children, what is the probability of eachof the following?(a) All three children are of normal phenotype.(b) One or more of the three children have the disease.(c) All three children have the disease.(d) At least one child is phenotypically normal.(Note: It will help to remember that the probabilities of allpossible outcomes always add up to 1.)
Spherocytosis is an inherited blood disease in whichthe erythrocytes (red blood cells) are spherical insteadof biconcave. This condition can be inherited in adominant fashion, with ANK1 (the nonfunctional mutant allele) dominant to ANK1+. In people with spherocytosis, the spleen recognizes the spherical redblood cells as defective and removes them from thebloodstream, leading to anemia. The spleen in different people removes the spherical erythrocytes withdifferent efficiencies. Some people with sphericalerythrocytes suffer severe anemia and some mild anemia, yet others have spleens that function so poorly nosymptoms of anemia exist at all. When 2400 peoplewith the genotype ANK1 ANK1+ were examined, itwas found that all of them had spherical erythrocytes,2250 had anemia of varying severity, and 150 had nosymptoms. (Assume that ANK1 ANK1 homozygotesdo not exist.)a. Does this description of people with spherocytosisrepresent incomplete penetrance, variable expressivity, or both? Explain…
The accompanying pedigree is for a rare, but relativelymild, hereditary disorder of the skin.a. How is the disorder inherited? State reasons for youranswer.b. Give genotypes for as many individuals in thepedigree as possible. (Invent your own defined allelesymbols.)c. Consider the four unaffected children of parentsIII-4 and III-5. In all four-child progenies from parentsof these genotypes, what proportion is expected tocontain all unaffected children?(picture added)
Does it matter that the precise meaning of the allelic symbols T, t, R, and r is not given? Why or why not?
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