Concept explainers
a.
To determine: The trait as recessive or dominant according to the offspring produced.
Introduction. The genetic material is all the living organism is the DNA (deoxyribonucleic acid). All the eukaryotes as well the prokaryotes have defined set of DNA sequence, which is inherited from one generation to another and codes for all the characters of the organism.
b.
To determine: The presence of trait as autosomal or sex linked.
Introduction. The DNA (deoxyribose
c.
To determine: The genotypes of parent and progeny.
Introduction. The process of
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Introduction To Genetic Analysis
- Determine what is the most likely mode of inheritance of this disease (whether it is inherited as the result of an X-linked dominant or X-linked recessive trait). Use "A" for the allele associated with the dominant phenotype, and lowercase "a"" for the allele associated with the recessive phenotype. Write the most probable genotype for each individual based on the mode of inheritance you have determined. Show how all the partners are crossed and the expected offspring produced (You may use Punnett Square). OT I OT do IIarrow_forwardIn the fruit fly, Drosophila melanogaster, eye color is affected by an X-linked gene with two alleles, w for white eyes and w+ for the wild-type red eyes. White eyes is a recessive trait. Females from a true-breeding strain with wild type eyes are crossed with males that have white eyes. a. What will be the phenotypes in the F1 generation? b. What will be the phenotypes in the F2 generation and in what portions are they expected?arrow_forwardIn certain cactus, prickly spines can be two-pronged or one-pronged. If a homozygous one-pronged cactus is crossed with a homozygous two-pronged cactus, the F1 generation has a mixture of spines (some are two-pronged, some are one-pronged). a. What are the genotypes of the parents and F1s?b. What mode of inheritance is exhibited? c. If the F1s were crossed, what proportion of the F2s will have genotypes like their parents?arrow_forward
- Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the A, a AA or Aa results in agouti color, while aa results in black coats. What F1 and F2 genotypic and phenotypic ratios are obtained from a cross between AACC and aacc mice? (F2: intercross between F1 offspring) Explain briefly the pattern of inheritance in this problem set and how you determined the phenotypic ratios in the offspring.arrow_forwarda. What is the type of inheritance? b. What is known of the genotype of the male in the above cross? c. What is known of the genotype of the female in the above cross? d. Provide map distances if possible.arrow_forwardIn Drosophila, an X-linked recessive mutation, Xm causes miniature wings. List the F2 phenotypic ratios if: a miniature-winged female is crossed with a normal male and a miniature-winged male is crossed with a normal female. What would the phenotypic ratio from (a) be if the miniature-winged gene were autosomal? Assume in all cases that the P1 individuals are true-breeding.arrow_forward
- 1) In pea plants, round seeds are dominant over wrinkled seeds. A Yellow seeded plant is crossed with a green seeded plant and the resulting cross produces 35 seeds. 12 of the seeds are yellow and 23 of the seeds are green. What are the genotypes of the parent plants? 2) In humans, blood type is inherited based on multiple alleles in which type A and type B are dominant to type O. A man who is type O, whose mother was type B, marries a woman who is type AB. What is the probability that they will produce a child that is type B? 3) In Guinea pigs black fur is dominant over white fur and smooth fur is dominant over rough fur. A heterozygous black, heterozygous smooth furred guinea pig mates with a white, heterozygous smooth furred guinea pig. Determine the phenotypic ratio for the predicted offspring from this crossingarrow_forwardGiven these parents-note, they are NOT quite the same as each other!: mom = Aa Bb Cc Dd dad = Aa Bb cc Dd NOTE that the A gene acts incompletely dominantly. a) What chance does their baby having the "strongest phenotype" in A, being recessive in b, recessive in c, and dominant in D? Give one fraction. Show work. b) phenotype? Now assume mom was CC instead of Cc. Now what is the chance of having that samearrow_forwardThe production of purple pigment in a certain species of flower is dependent upon two gene loci. You cross two purple flowered plants that are heterozygous at each gene locus. The offspring show the following phenotypes: 91 purple and 68 white.a. What is the simplified phenotypic ratio is observed in the offspring? What mode of inheritance is associated with this ratio? b. What is/are the genotype(s) of the purple offspring? What is/are the genotype(s) of the white offspring?arrow_forward
- For this problem, use the information given in problem 15. A young woman with blood type O gave birth to a baby with blood type O. In a court case, she claims that a certain young man is the father of her child. The man has type A blood. Could he be the father? Can it be proven on this evidence alone that he is the father? ^Need answers to that one, including genotype, phenotype gametes and punnett square. This is question 15 as a little background dont need this solved . In humans, there are three alleles for blood type: A, B, and O. The allele for blood type A and the allele for blood type B show incomplete dominance. A person with both alleles has blood type AB. Both A and B dominate type O. A person with alleles for blood types A and O marries someone with alleles for blood types B and O. List the types of blood their offspring could have and the probability for each blood type in the offspringarrow_forwardNormal pigmentation in humans is completely dominant to albinism. A couple who are both carriers for albinism decided to have children. a. Given that their first offspring normally pigmented, what is the probability that the child is a carrier? b. Considering the same genotypes of parents, what is the likelihood that three albino and two are normally pigments in a brood of five?arrow_forwardIn humans, the genes for red-green color blindness (R = normal, r = color blind) and hemophilia A (H = normal, h = hemophilia) are both X-linked and only 3 map units apart. Suppose a woman has four sons, and two are color blind but have normal blood clotting and two have hemophilia but normal color vision. What is the probable genotype of the woman? HR/hr Hr/hr hr/hR Hr/hR HR/Hrarrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage LearningHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning