In Alaskan Malamute dogs, an autosomal recessive allele causes a condition in which the cartilage in the front legs fails to develop properly. This results in a type of dwarfism. Dogs with the dominant wild-type allele are of normal height. In the same breed of dogs, there is an autosomal dominant allele that codes for a curled tail and a recessive allele that codes for an uncurled tail. Show the possible genotypes for the offspring of a dog heterozygous for height and tail curl crossed with a dog recessive for both traits. Your answer must include the use of a Punnett square and a legend indicating the allele symbols used.

In Alaskan Malamute dogs, an autosomal recessive allele causes a condition in which the cartilage in the front legs fails to develop properly. This results in a type of dwarfism. Dogs with the dominant wild-type allele are of normal height. In the same breed of dogs, there is an autosomal dominant allele that codes for a curled tail and a recessive allele that codes for an uncurled tail. Show the possible genotypes for the offspring of a dog heterozygous for height and tail curl crossed with a dog recessive for both traits. Your answer must include the use of a Punnett square and a legend indicating the allele symbols used.

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter19: Introduction To Genetics

Section: Chapter Questions

Problem 9CT

See similar textbooks

Similar questions

In a particular human family, John and his motherboth have brachydactyly (a rare autosomal dominant allele causing short fingers). John’s father hasHuntington disease (another rare autosomal dominant allele). John’s wife is phenotypically normaland is pregnant. Two-thirds of people who inheritthe Huntington (HD) allele show symptoms by age50, and John is 50 and has no symptoms.Brachydactyly is 90% penetrant.a. What are the genotypes of John’s parents?b. What are the possible genotypes for John? Howlikely is John to have each of these genotypes?c. What is the probability the child will express bothbrachydactyly and Huntington disease by age 50 ifthe two genes are unlinked?d. How will your answer to part (c) change if insteadthese two loci are 20 m.u. apart?
A rare recessive allele inherited in a Mendelian mannercauses the disease cystic fibrosis. A phenotypically normal man whose father had cystic fibrosis marries a phenotypically normal woman from outside the family, andthe couple consider having a child.a. Draw the pedigree as far as described.b. If the frequency in the population of heterozygotesfor cystic fibrosis is 1 in 50, what is the chance that thecouple’s first child will have cystic fibrosis?c. If the first child does have cystic fibrosis, what is theprobability that the second child will be normal?
. Tay-Sachs disease is a rare human disease in which toxic substances accumulate in nerve cells. The recessiveallele responsible for the disease is inherited in a simpleMendelian manner. For unknown reasons, the allele ismore common in populations of Ashkenazi Jews ofeastern Europe. A woman is planning to marry her firstcousin, but the couple discovers that their sharedgrandfather’s sister died in infancy of Tay-Sachsdisease.a. Draw the relevant parts of the pedigree, and showall the genotypes as completely as possible.b. What is the probability that the cousins’ first childwill have Tay-Sachs disease, assuming that all peoplewho marry into the family are homozygous normal?
Cystic fibrosis (CF) is an autosomal recessive condition triggered by the overproduction of stickymucus that clogs the lungs and pancreas. It is a life-threatening disease, but medical advances helpedthe afflicted to live through adulthood.The mother of Claudia died from cystic fibrosis, but her father was normal and never had anyrelative with CF. Her fiancé, Marcus, turned out to be a carrier of the CF allele. What are the genotypes of Claudia and Marcus? Claudia: ________________________ Marcus: _____________________ They planned to have four children. What is the probability that: a. all children will be normal b. at least two will be normal
Among Native Americans, two types of earwax (cerumen) are seen, dry and sticky. A geneticist studied theinheritance of this trait by observing the types of offspring produced by different kinds of matings. Heobserved the following numbers:OffspringParents Number of mating pairs Sticky DrySticky × sticky 10 32 6Sticky × dry 8 21 9Dry × dry 12 0 42a. How is earwax type inherited?b. Why are no 3:1 or 1:1 ratios present in the datashown in the chart?
Pea plants have pods that are smooth (inflated) or constricted in shape and green or yellow incolor. These two autosomal traits observe the laws of Mendelian inheritance and assortindependently of one another. One gene affects pod shape and one gene affects pod color. Theallele for the smooth shape of pods (I) is dominant over the allele for the constricted shape ofpods (i) and the allele for the green color of pods (G) is dominant over the allele for the yellowcolor of pods (g).A pure breeding female parental pea plant with smooth green pods is cross-fertilized with a purebreeding parental male pea plant with constricted yellow pods. The resulting F1 generationplants are then self-fertilized and F2 generation progeny are obtained.The distribution of the appearance or phenotypes of the pods of the F2 generation plants are______.a- 100% smooth green podsb- 100% constricted yellow podsc- 50% smooth green pods, 50% constricted yellow pods, 0% smooth yellow pods, 0%constricted green podsd-…
a human disease known as cystic fibrosis is inherited as a recessive trait.Two unaffected individuals have a first child with the disease. What isthe probability that their next two children will not have the disease?
In individuals affected by cystic fibrosis, salt crystals may appear afterperspiration dries up. In addition, the disease causes respiratory disorderswhich can be both debilitating and lethal. It occurs in individuals homozygousfor recessive gene. If 2 normal parents had a daughter with the symptoms ofthis disease, and a normal son, what is the probability that he might be acarrier of the recessive gene?Express answer in fraction form.
Tay-Sachs disease is a rare human disease in which toxic substances accumulate in nerve cells. The recessive allele responsible for the disease is inherited in a simple Mendelian manner. For unknown reasons, the allele is more common in populations of Ashkenazi Jews of eastern Europe. A woman is planning to marry her first cousin, but the couple discovers that their shared grandfather’s sister died in infancy of Tay-Sachs disease.a. Draw the relevant parts of the pedigree, and show all the genotypes as completely as possible. b. What is the probability that the cousins’ first child will have Tay-Sachs disease, assuming that all people who marry into the family are homozygous normal?
Cystic 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. The mother of Claudia died from cystic fibrosis, but her father was normal and never had any relative with CF. Her fiancé, Marcus, turned out to be a carrier of the CF allele. What are the genotypes of Claudia and Marcus? Claudia: ________________________ Marcus: _____________________ They planned to have four children. What is the probability that: a. all children will be normal b. at least two will be normal PLEASE SHOW COMPLETE SOLUTION
raccoons may have wide, medium-sized, or narrow bands around their tails. They may also havethe habit of washing all, or some of their food, or do not wash their food at all. a) assign genotypes to the phenotypes mentioned (see attached table) b. What mode of inheritance would most likely be exhibited by these traits if crosses were made? c. If two raccoons with medium-sized tail bands and have the habit of washing some of theirfoods will be crossed, what is the probability of having F1 raccoons with: c.1 wide tail bands that won’t wash any of their food? c.2 the same genotype as the parent raccoons? d. If a raccoon with a wide tail band that washes only some of its food is crossed with a raccoonwith a narrow tail band that doesn’t wash any food, what percentage of their offspring wouldbe medium-tailed and washes all its food? Show COMPLETE cross.
In rabbits, the color of body fat is controlled by a single genewith two alleles, designated Y and y. The outcome of this traitis affected by the diet of the rabbit. When raised on a standardvegetarian diet, the dominant Y allele confers white body fat,and the y allele confers yellow body fat. However, when raisedon a xanthophyll-free diet, a homozygote yy rabbit has whitebody fat. If a heterozygous rabbit is crossed to a rabbit withyellow body fat, what are the proportions of offspring withwhite and yellow body fat when raised on a standard vegetariandiet? How do the proportions change if the offspring are raisedon a xanthophyll-free diet?