Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 8, Problem 9LTB
Summary Introduction
Introduction:
Color blindness is X-linked recessive disorder. The person suffering from this must have recessive allele on X genes. Moreover, the color blindness is mostly found in males and females are the carriers of this disease.
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Which of the following statements about X-linked recessive inheritance is true?
X-linked recessive traits appear more frequently in females than males.
X-linked traits are only found in humans.
Females who are carriers of an X-linked recessive trait may not exhibit any phenotypic effects.
Males have two allele copies of X-linked genes.
A man with X-linked color blindness marries a woman with no history of color blindness in her family. The daughter of this couple marries a normal man, and their daughter also marries a normal man. What is the chance that this last couple will have a child with color blindness? If this couple has already had a child with color blindness, what is the chance that their next child will be color blind?
Color-blindness is an X-linked recessive disorder. Under what circumstances will this condition manifest in a child?
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If the child is a male and its mother has the recessive allele
If the child is a female and its father has the recessive allele
If the child is a female and its mother has the recessive allele
If the child is a male and its father has the recessive allele
Chapter 8 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 8 - What is the relationship between genotype and...Ch. 8 - Add labels to the figure that follows, which...Ch. 8 - Prob. 3LTBCh. 8 - Prob. 4LTBCh. 8 - Prob. 5LTBCh. 8 - Scientists have recently developed a process by...Ch. 8 - What is the physical basis for the independent...Ch. 8 - Prob. 8LTBCh. 8 - Prob. 9LTBCh. 8 - Prob. 10LTB
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- Redgreen color blindness is an X-linked recessive disorder in humans. Your friend is the daughter of a color-blind father. Her mother had normal color vision, but her maternal grandfather was color-blind. What is the probability that your friend is color-blind? (a) 1 (b) (c) (d) (e) 0arrow_forwardAnalysis of X-Linked Dominant and Recessive Traits A young boy is color-blind. His one brother and five sisters are not. The boy has three maternal uncles and four maternal aunts. None of his uncles children or grandchildren is color-blind. One of the maternal aunts married a color-blind man, and half of her children, both male and female, are color-blind. The other aunts married men who have normal color vision. All their daughters have normal vision, but half of their sons are color-blind. a. Which of the boys four grandparents transmitted the gene for color blindness? b. Are any of the boys aunts or uncles color-blind? c. Is either of the boys parents color-blind?arrow_forwardFor an X-linked recessive allele, what proportion of female offspring will be carriers in the cross of an affected father and a noncarrying mother? 0 percent 100 percent 50 percentarrow_forward
- In humans, an X-linked disorder called coloboma iridia (a fissure in the iris_ is a recessive trait. A normal couple has an afflicted daughter. What would be the most plausible scenario for this situation? the female is not the biological mother, but the male is the biological father the father carries one recessive allele, and the mother carries one recessive allele the mother carries two recessive alleles the male is not the biological father, but the female is the biological mother both parents are heterozygous for the traitarrow_forwardA mother is a carrier of a recessive X-linked disorder. What are the chances of her offspring being afflicted by this disorder assuming a healthy father? 100% chance for male offspring; ~0% chance for female offspring 50% chance for male offspring; ~0% chance for female offspring 0% chance for male offspring; ~0% chance for female offspring 25% chance for male offspring; ~25% chance for female offspring 50% chance for male offspring; ~50% chance for female offspringarrow_forwardWhen looking at an X-linked recessive trait, if an affected mother and an unaffected father have a homogametic child, what is the probability that this homogametic child is unaffected? 0.25 1 0 0.5arrow_forward
- Which of the following statements about X-linked recessive patterns is true? The X-linked trait appears more often in females than in males. An affected father can never pass an X-linked recessive allele to an XY son. An affected father can never pass an X-linked recessive allele to a daughter. Heterozygous females always express the X-linked recessive trait.arrow_forwardIn humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision (her father was colorblind) marries a man who has normal color vision. The man has brown eyes, but his mother had blue eyes. What is the probability that this couple will have a child with normal vision and blue eyes?arrow_forwardRed–green color blindness is an X-linked recessive trait. Susan has normal color vision, but her father is color blind. Susan marries Bob, who has normal color vision. Q. Susan and Bob have a daughter named Betty, who has normal color vision. If Betty marries a man with normal color vision, and they have a son, what is the probability that the son will be color blind?arrow_forward
- In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision (her father was colorblind) marries a man who has normal color vision. The man has brown eyes, but his mother had blue eyes. What is the probability that this couple will have a son with brown eyes? What is the probability that this couple will have a color blind son with blue eyes?arrow_forwardAn individual that is genetically male develops as a female. Is this individual more or less likely to express an X-linked recessive disorder than an average female?arrow_forwardA form of hemophilia is caused by a sex-linked (X-linked) recessive gene. A phenotypically normal woman whose father had hemophilia marries a man who suffers with hemophilia. What is the probability that their first daughter will have hemophilia?arrow_forward
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