Concept explainers
To explain:
The chance of having a hemophilic son from a hemophilic father and a carrier mother.
Introduction:
Genetic disorders result from inheritance of traits which are either dominant or recessive. Traits that are controlled by genes located on sex chromosomes; X chromosomes in particular are called sex- linked traits or X- linked traits.Hemophilia is a sex- linked recessive disorder caused by a lack of blood clotting agent called factor VIII.
Answer to Problem 11STP
When a mother is a carrier of the gene, and father suffers from hemophilia;
There is 50% chance that son will also carry the gene and express it.
Explanation of Solution
Traits that are controlled by genes located on sex chromosomes; X chromosomes in particular are called sex- linked traits or X- linked traits. Since males have only X chromosome, they are affected by recessive X- linked traits more often than females. Females usually do not express the recessive trait as other X chromosome will mask the effect of the recessive trait.
According to the given information, father is hemophilic but mother is a carrier of the trait. The genotypes of the offspring can be checked with the help of a Punnett square.
Let XH= Normal
Xh= hemophilia
Y= Y chromosome
The mother is a carrier of thedisease so she has the recessive allele for hemophilia on one of her X chromosomes. The father is hemophilic so he has the recessive allele on the X chromosome.
Xh | Y | |
XH | XHXh | XHY |
Xh | XhXh | XhY |
Out of the two sons, only one son will have hemophilia as he receives the recessive allele from his mother. So there is 50% chance of a boy to have hemophilia.
Chapter 13 Solutions
Biology Illinois Edition (Glencoe Science)
Additional Science Textbook Solutions
Microbiology: An Introduction
Biology: Life on Earth
Human Biology: Concepts and Current Issues
Microbiology: An Introduction (13th Edition)
Campbell Essential Biology with Physiology (5th Edition)
Fundamentals of Anatomy & Physiology Plus Mastering A&P with eText - Access Card Package (10th Edition) (New A&P Titles by Ric Martini and Judi Nath)
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education