Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 13, Problem 4RQ
X-linked recessive traits in humans (or in Drosophila) are observed.
- in more males than females
- in more females than males
- in males and females equally
- in different distributions depending on the trait
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Explain why X-linked recessive traits in humans are observed in more males than females.
X-linked recessive traits in humans (or in Drosophila) are observed ________. a. in more males than females b. in more females than males c. in males and females equally d. in different distributions depending on the trait
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.
Chapter 13 Solutions
Biology 2e
Ch. 13 - Figure 13.3 In a test cross for two...Ch. 13 - Figure 13.4 Which of the following statements is...Ch. 13 - Figure 13.6 Which of the following statements...Ch. 13 - X-linked recessive traits in humans (or in...Ch. 13 - The first suggestion that chromosomes may...Ch. 13 - Which recombination frequency corresponds to...Ch. 13 - Which recombination frequency corresponds to...Ch. 13 - Which of the following codes describes position 12...Ch. 13 - In agriculture, polyploid crops (like coffee,...Ch. 13 - Assume a pericentric inversion occurred in one of...
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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_forwardExplain why X-linked recessive traits are often more common in males but X-linked dominant traits are often more common in females.arrow_forwardLesch-Nyhan syndrome is caused by a X-linked recessive mutations. Accordingly, Lesch-Nyhan syndrome _______. Group of answer choices - occurs more frequently in males than in females - occurs with equal frequency in males and females, but is more severe in males - occurs with equal frequency in males and females, but is more severe in females - occurs with equal frequency in males and females - occurs more frequently in females than in malesarrow_forward
- Which of the following statements is true regarding the inheritance of a human X-linked recessive trait if the mother is a carrier and the father is affected? a) At least one affected individual will be present in every generation b) all sons will be affected c) None of the offspring will be affected d) all daughters will be affected e) on average, half of the daughters will be affected and half of the sons will be affectedarrow_forwardRed–green color blindness in humans is due to an X-linked recessive gene. Both John and Cathy have normal color vision. After 10 years of marriage to John, Cathy gave birth to a color-blind daughter. John filed for divorce, claiming that he is not the father of the child. Is John justified in his claim of nonpaternity? Explain why. If Cathy had given birth to a color-blind son, would John be justified in claiming nonpaternity?arrow_forwardIf a gene is X-linked, explain why the recessive phenotype would be more often seen in males then in females. Also explain what the term “carrier” means related to these traits.arrow_forward
- Color blindness is caused by an X-linked recessive allele that is rare in humans. Suppose two parents have normal color vision and color-blind fathers. What is the chance that their second son will have normal vision?.arrow_forwardIn Drosophila (fruit flies) the gene for eye color is X-linked. The allele R codes for red eyes and is dominant to its allele r, which codes for white eyes. Give the genotypic and phenotypic ratios for the expected offspring from mating a white eyed male and a heterozygous red eyed female.arrow_forwardWhy do X-linked recessive conditions appear most commonlyin males?arrow_forward
- Which of the following is not a characteristic of X-linked recessive traits in humans? a. Approximately one-half of the sons of a female carrier are affected. b. More males than females affected. c. Phenotypically normal daughters of affected men are always carriers. d. They cannot be passed from father to son. e. Affected daughters always have an affected mother.arrow_forwardWhich of the following disorders in humans has an X-linked recessive inheritance pattern? Red-green color blindness Marfan syndrome Tay-Sachs disease Hutchinson-Gilford progeriaarrow_forwardIn 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_forward
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