EBK BIOLOGY:SCIENCE F/LIFE
6th Edition
ISBN: 9780134819167
Author: BELK
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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Color blindness is an X-linked recessive disease. A female and a
male with normal vision have 4 children. The phenotypes of the
children are listed below:
2 Colorblind males, 1 normal vision female, one normal vision
male.
Given these results, the female must be a carrier for
colorblindness.
True
False
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?
A 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 offspring
Chapter 8 Solutions
EBK BIOLOGY:SCIENCE F/LIFE
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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- Analysis 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_forwardRedgreen 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_forwardCan a male be a carrier of red-green color blindness?arrow_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 color-blind man marries a woman with normal vision whose father was color-blind. Remember that color-blindness is an X-linked recessive trait. Hint: see figure 12.7 in book. A) What is the probability that their first child will be a color-blind daughter? B) What is the probability that their first son will be color-blind?arrow_forwardRed-green color blindness in humans is due to an X- linked recessive gene. Both John and Cathy have normal color vision. Cathy is adopted, and knows nothing about her biological parents. After 10 years of marriage to John, Cathy has given birth to a color-blind daughter and a color-blind son. John filed for divorce, claiming that he is not the father of at least one of the children. Is John justified in his claim of nonpaternity? Yes. He cannot be the father of Cathy's son. b. Yes, He cannot be the father of either child. O c. No. He is the father of both children. d. Yes. He cannot be the father of Cathy's daughter. Next page ge ems: X Inactivation, Nondisjunction, Quiz 3 Sex-linked Traits> Jump to... Pedigree FEB 17 MacBook Air 80 DII DD F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 @ #3 $4 & *arrow_forward
- Color-blindness is an X-linked recessive disorder. Under what circumstances will this condition manifest in a child? Top of Form 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 allelearrow_forwardIf a father is affected by an X-linked dominant condition and the mother is normal, what is the probability of their children being affected? All sons will be affected. Half of the sons will be affected. All daughters will be affected. Half of the daughters will be carriers.arrow_forwardA female carrier of the X-linked recessive gene for red-green color blindness will display a phenotype of normal vision. red-green color blindness. XXC.arrow_forward
- If a trait is X-linked, which of the following statements is true? Two recessive alleles are needed to express that trait. A female with one recessive allele will express that trait. A female can be a carrier, affected or unaffected. The trait is inherited from father to son. The gene is carried on the Y chromosome.arrow_forwardWhich 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.arrow_forwardBaldness is a recessive, X-linked trait. Mom has a full head of hair but she is a carrier for baldness and her husband has a full head of hair. What are the chances of they having a child who is bald? 0% (no chance) 50% 75% 100% (all of them will be) 25%arrow_forward
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