Human Biology
11th Edition
ISBN: 9781305264540
Author: STARR, Cecie; McMillan, Beverly
Publisher: Brooks Cole
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Chapter 20, Problem 5CT
Summary Introduction
To explain: The probability of the first male child of a woman unaffected by hemophilia A but had a father with hemophilia A and marries a man with hemophilia A.
Introduction: Hemophilia A is an X-linked homozygous recessive genetic disorder. Probability in genetics is used to determine the outcome of genotypes of offspring and the probability of its occurrence when parent genotypes are known.
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A normal women whose father was a hemophilia marries a normal man. What is the chance of hemophilia in their children?
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A woman who is a carrier for hemophilia marries a normal man.
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Chapter 20 Solutions
Human Biology
Ch. 20 - Prob. 1RQCh. 20 - What is a carrier of a genetic trait?Ch. 20 - What evidence indicates that a trait is coded by a...Ch. 20 - Prob. 4RQCh. 20 - Explain what nondisjunction is, and give two...Ch. 20 - _______ segregate during ______. a. Homologues;...Ch. 20 - Prob. 2SQCh. 20 - Genes on the same chromosome tend to stay together...Ch. 20 - Prob. 4SQCh. 20 - A chromosomes structure can be altered by _______....
Ch. 20 - Nondisjunction can be caused by ________. a....Ch. 20 - A gamete affected by nondisjunction could have...Ch. 20 - Genetic disorders can be caused by __________. a....Ch. 20 - A person who is a carrier for a genetic trait...Ch. 20 - Prob. 10SQCh. 20 - If a couple has six boys, what is the probability...Ch. 20 - Human sex chromosomes are XX for females and XY...Ch. 20 - People with Down syndrome have an extra copy of...Ch. 20 - Prob. 4CTCh. 20 - Prob. 5CTCh. 20 - About 4 percent of people of Northern European...Ch. 20 - The following pedigree shows the pattern of...
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- State the probability that a child with a carrier mother willhave hemophilia A.arrow_forwardA man with haemophilia (h) marries a woman who does not manifest the disorder, but who is a carrier of haemophilia? What are the probability that their daughter will have haemophilia? That their son will be haemophilic?arrow_forwardA normal woman, whose father was a hemophiliac, marries a normal man. Determine the genotype of the woman and the man. Determine the possible genotypes of their children. What percent of male and female children would be hemophiliacs? What percent normal? Would any be carriers?arrow_forward
- Define the term hemochromatosis?arrow_forwardIn humans, as well as with many other animals, sex is determined by special sex chromosomes. An individual containing two X chromosomes is a female, while an individual possessing an X and Y chromosome is a male. he sex chromosomes bear alleles for traits. Sex linkage applies to genes that are located on the sex chromosomes. These genes are considered sex-linked because their expression and inheritance patterns differ between males and females. The genes present on the X chromosome are said to be X linked. Many more genes are present on the X chromosome than found on the Y chromosome. Nonetheless, those genes found on the Y chromosome are said to be Y linked. The Y chromosome is smaller than its homologue, the X chromosome. Consequently, most of the loci present on the X chromosome are absent on the Y chromosome. 1. In humans, hemophilia is a sex linked trait. Females can be normal, carriers, or have the disease. Males will have the disease or not (but they won't be ever carriers) XH…arrow_forwardWhat is the form an individual with sickle-cell anemia?arrow_forward
- A couple is concerned their child will be born with sickle cell anemia. The woman does not have sickle cell anemia. The woman’s mother had sickle cell anemia and her father was a carrier of the sickle cell gene. The man knows that he is a carrier of the sickle cell gene. What is the probability that the child will have sickle cell anemia?arrow_forwardThe term "hematopoiesis" refers to:arrow_forwardCross a woman who is a carrier for hemophilia to a hemophiliac man. a) What fraction of the offspring will be carrier females? b) What fraction will be normal males? c) What fraction will be normal females? ("Normal" meaning that they do not have hemophilia.) What fraction will be hemophiliac females? e) What is the genotype of the carrier female? f) How many different genotypes are possible among the offspring? 3.arrow_forward
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