4. What is the probability that a child will be born with sickle-cell anemia if his mother and father are both heterozygous dominant for the hemoglobin's shape gene? H normal gene for hemoglobin's shape; Dominant h abnormal gene for hemoglobin's shape, Recessive a. 50% chance b. 75% chance c. 25% chance d. 0% chance NOTE: 2 copies of the abnormal gene are needed to get sickle-cell anemia

4. What is the probability that a child will be born with sickle-cell anemia if his mother and father are both heterozygous dominant for the hemoglobin's shape gene? H normal gene for hemoglobin's shape; Dominant h abnormal gene for hemoglobin's shape, Recessive a. 50% chance b. 75% chance c. 25% chance d. 0% chance NOTE: 2 copies of the abnormal gene are needed to get sickle-cell anemia

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter14: Chromosomes And Human Inheritance

Section: Chapter Questions

Problem 4SQ

See similar textbooks

Similar questions

2. The common grandfather of two first cousins has hereditary hemochromatosis, a recessive condition causing an abnormal buildup of iron in the body. Neither ofthe cousins has the disease nor do any of their relatives.a. If the first cousins had a child, what is the chancethat the child would have hemochromatosis?Assume that the unrelated, unaffected parents ofthe cousins are not carriers.b. How would your calculation change if you knewthat 1 out of every 10 unaffected people in the population (including the unrelated parents of thesecousins) was a carrier for hemochromatosis?
1. A woman who is heterozygous for hemophilia marries a man with hemophilia. What are the genotypes and phenotypes of the children? a) What is the genotypic ratio of the above cross (Write number next to genotype)? ___________________________________________________________________ b) What is the phenotypic ratio of the above cross? (Write number next to phenotype)? ___________________________________________________________________
7. The ability to roll your tongue (R) is dominant to lack of this ability (r). A. What is the genotype of a man who can roll his tongue if his father couldn’t? B. If a man who is heterozygous for tongue rolling marries a woman who is heterozygous, what would you predict for the genotypes and phenotypes of their children?
9. The factors for normal hemoglobin (S) and sickle-cell hemoglobin (s) are considered codominants: heterozygous individuals have some normal red blood cells and some sickle cells but are not considered to have the disease. A heterozygote is said to have the sickle-cell trait but not the disease. A. What is the genotype of a man with the sickle-cell trait? B. If normal man marries a heterozygous woman, what do you expect for the genotypes and phenotypes of their children? C. If 2 heterozygous people marry and have 3 children who don’t have the disease, what is the chance that their fourth child will have the disease? D. Assume that medical science finds a treatment for sickle-cell anemia so that people with the disease can live out a normal life span but their genes are not changed. If 2 people are saved from the effects of the disease, marry, and have children, what would you expect for the genotypes and phenotypes of their children? Would the children…
3. Hemophilia is a sex linked trait that does not allow for blood clotting normally. It is a recessive genetic defect. In the royal family, the mother of the Prince is a carrier for hemophilia. (XHXh) while the father is normal. ( XHY) . What is the genotype of the Prince if he carries the bleeder’s disease? What is the probability that all the female princesses are normal? Use the Punnett square to show your solution.
5. Which of the following couples could have a boy with Duchenne muscular dystrophy (DMD)? a. a male with Duchenne muscular dystrophy and a homozygous dominant female b. a male without Duchenne muscular dystrophy and a homozygous dominant female c. a male without Duchenne muscular dystrophy and a carrier female d. a and c e. none of the above
3) The ability to curl ones’ tongue up on the sides (T) is dominant to not being able to roll your tongue (t). a. A woman who can roll her tongue marries a man who cannot. The first child has the same phenotype as the father, what are the genotypes of the mother, father, and this child? b. What is the probability that the second child won’t be able to roll it’s tongue?
4.) A man and a woman have a child. The father is blood type A, and one of his parents was blood type A and the other was blood type O. The mother is blood type B, and one of her parents was blood type B, the other type O. Both the father and the mother are carriers of the Bombay allele. (Neither of the type-O grandparents were type O because of the Bombay allele – they had the regular type O genotype.) WhataretheoddsthattheirbabywillhavebloodtypeO? WhataretheoddsthattheirbabywillhavebloodtypeAB? (Hint – for this question, you should draw out a pedigree and fill in as much as you can for the genotypes of BOTH genes that are involved.)
4. A man with blood type A and a women with blood type B have three children. A daughter with AB and two sons, one with type B and one with type O blood. What are the genotypes of the parents?
6. A woman and a man, both with normal clotting blood, have a son who has hemophilia. Both of their daughtersare normal. (Note: Assume all possibilities in the children are represented.)a. What pattern of inheritance is this?b. What is the genotypes of the parents?c. If they decide to have another child, what is the chance it will be a boy who has hemophilia? A girl whohas hemophilia?
5)If an individual has no widow's peak, but both parents have widow's peaks, which genotypes are possible for the parents? a)Group of answer choices b)Homozygous recessive c)Heterozygous d)Unable to determine e)Homozygous dominant
6. Consider that people with blue eyes must have two alleles for blue eyes since blue eye color is a recessive trait. A blue-eyed person and a brown-eyed person have an offspring with blue eyes. The brown-eyed person must A. have two alleles for blue eyes. B. have two alleles for brown eyes. C. not have the dominant brown eye allele. D, have one allele for blue eyes and one allele for brown eyes.