A young boy is colorblind. His one brother and five sisters arenot. The boy has three maternal uncles and four maternal aunts.None of his uncles's children or grandchildren are colorblind. Oneof the maternal aunts married a colorblind man, and half of herchildren, both male and female, are colorblind. The other auntsmarried men who have normal color vision. All their daughters havenormal color vision, but half of their sons are colorblind. 1. Which of the boy's four grandparents transmittied the gene forcolorblindness? 2. Are any of the boy's aunts and uncles colorblind? 3. Are either of the boy's parent colorblind?
A young boy is colorblind. His one brother and five sisters arenot. The boy has three maternal uncles and four maternal aunts.None of his uncles's children or grandchildren are colorblind. Oneof the maternal aunts married a colorblind man, and half of herchildren, both male and female, are colorblind. The other auntsmarried men who have normal color vision. All their daughters havenormal color vision, but half of their sons are colorblind. 1. Which of the boy's four grandparents transmittied the gene forcolorblindness? 2. Are any of the boy's aunts and uncles colorblind? 3. Are either of the boy's parent colorblind?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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A young boy is colorblind. His one brother and five sisters arenot. The boy has three maternal uncles and four maternal aunts.None of his uncles's children or grandchildren are colorblind. Oneof the maternal aunts married a colorblind man, and half of herchildren, both male and female, are colorblind. The other auntsmarried men who have normal color vision. All their daughters havenormal color vision, but half of their sons are colorblind.
1. Which of the boy's four grandparents transmittied the gene forcolorblindness?
2. Are any of the boy's aunts and uncles colorblind?
3. Are either of the boy's parent colorblind?
1. Which of the boy's four grandparents transmittied the gene forcolorblindness?
2. Are any of the boy's aunts and uncles colorblind?
3. Are either of the boy's parent colorblind?
Expert Solution
Step 1
Colorblindness is a X-linked recessive disease. The alleles of the trait are carried in the X chromosome. Let, XC be the recessive allele, and X be the normal dominant allele. Females with XCXC will be colorblind whereas those female having XXC(carrier) and XX will be normal. Since males have only one X chromosome, those having XCY will be colorblind and those with XY will be normal.
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