Color-blindness is a recessive disorder found on the X chromosome. There can be individuals that are carriers forthe trait (Of the two X chromosomes they have, only one has the colorblindness allele while the other is normal.In this pattern of inheritance, all carriers are female). We express sex-linked traits with respect to our sexchromosomes. For example, if the allele for colorblindness is "b" and the allele for normal color vision is "B",then a female carrier is X x.IIIIIIV6. What are the two sex chromosomes for females?What are the two sex chromosomes formales?7. Is the Generation I male colorblind?his sex chromosomes)?.What is his genotype (be sure to express it with regard to8. Why are all the females in Generation II carriers? (be careful: one of the females shown "married in" to thefamily)9. The first couple in Generation II has four children. Show the genotypes of their daughters. What is theprobability their daughters will be carriers?10. If a female carrier of the color-blindness gene marries a man with normal vision, what is the probability ththeir first child will be both MALE and COLORBLIND?

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Description: Color-blindness is a recessive disorder found on the X chromosome. There can be individuals that are carriers forthe trait (Of the two X chromosomes they have, only one has the colorblindness allele while the other is normal.In this pattern of inher

X linked Recessive Disorder: Genetic problems related with mutations in genes on the X chromosome…

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sive disorder found on the X chromosome. There can be individuals that are carriers for the trait (or the two X chromosomes they have, only one has the colorblindness allele while the other is normal. In this pattern of inheritance, all carriers are female), We express sex-linked traits with respect to our sex chromosomes. For example, if the allele for colorblindness is "b" and the allele for normal color vision is "B", then a female carrier is X x, DE II II IV What are the two sex chromosomes for 6. What are the two sex chromosomes for females? males? 7. Is the Generation I male colorblind? his sex chromosomes)?. What is his genotype (be sure to express it with regard to 8. Why are all the females in Generation Il carriers? (be careful: one of the females shown "married in" to the family) 3. The first couple in Generation Il has four children. Show the genotypes of their daughters. What is the probability their daughters will be carriers? D. If a female carrier of the color-blindness gene marries a man with normal vision, what is the probability th eir first child will be both MALE and COLORBLIND?

sive disorder found on the X chromosome. There can be individuals that are carriers for the trait (or the two X chromosomes they have, only one has the colorblindness allele while the other is normal. In this pattern of inheritance, all carriers are female), We express sex-linked traits with respect to our sex chromosomes. For example, if the allele for colorblindness is "b" and the allele for normal color vision is "B", then a female carrier is X x, DE II II IV What are the two sex chromosomes for 6. What are the two sex chromosomes for females? males? 7. Is the Generation I male colorblind? his sex chromosomes)?. What is his genotype (be sure to express it with regard to 8. Why are all the females in Generation Il carriers? (be careful: one of the females shown "married in" to the family) 3. The first couple in Generation Il has four children. Show the genotypes of their daughters. What is the probability their daughters will be carriers? D. If a female carrier of the color-blindness gene marries a man with normal vision, what is the probability th eir first child will be both MALE and COLORBLIND?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter19: Introduction To Genetics

Section: Chapter Questions

Problem 9CT

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The most common form of colorblindness is a recessive, sex-linked hereditary con dition caused by a defect on the X chromosome. Females are XX, while males are XY. Individuals inherit one chromosome from each parent, with equal probability; for example, an individual has a 50% chance of inheriting their father's X chromosome, and a 50% chance of inheriting their father's Y chromosome. If a male has an X chromosome with the defect, he is colorblind. However, a female with only one defective X chromo some will not be colorblind. Thus, colorblindness is more common in males than females; 7% of males are colorblind but only 0.5% of females are colorblind. (a) Assume that the X chromosome with the wild-type allele is X+ and the one with the disease allele is X. What is the expected frequency of each possible female genotype: X+X+, X+X¯, and X-X-? What is the expected frequency of each possible male genotype: X+ Y and X-Y? (b) Suppose that two parents are not colorblind. What is the…
In humans, color vision depends on genes encodingthree pigments. The R (red pigment) and G (green pigment) genes are close together on the X chromosome,whereas the B (blue pigment) gene is autosomal. A recessive mutation in any one of these genes can cause colorblindness. Suppose that a color-blind man married awoman with normal color vision. The four sons from thismarriage were color-blind, and the five daughters werenormal. Specify the most likely genotypes of both parents and their children, explaining your reasoning. (Apedigree drawing will probably be helpful.) (Problem 50is by Rosemary Redfield.)
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.Hemophilia is a blood-clotting disorder in humans that followsan X-linked recessive pattern of inheritance. A man with hemophilia and a woman without hemophilia have a daughter withhemophilia. If you let H represent the normal allele and h thehemophilia allele, what are the genotypes of the parents?a. Mother is XHXhand father is XhY.b. Mother is XhXhand father is XhY.c. Mother is XhXhand father is XHY.d. Mother is XHXhand father is XHY
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In humans, the genes for colorblindness and hemophilia are both located on the X chromosome with no corresponding gene in the Y. These are both recessive alleles. If a man and a woman, both with normal vision, marry and have a colorblind son, draw the Punnet square that illustrates this. If the man dies and the woman remarries a colorblind man, draw a Punnet Square showing the type of children that could be expected from the second marriage. How many/what percentages of each could be expected.