Multiple Choice
A woman is a carrier for red-green color blindness, a sex-linked trait. Her husband is normal (not color-blind) for this trait. What are the chances that their newborn daughter will be red-green color-blind?
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13. Mendelian Genetics
Sex-Linked Inheritance
Back13. Mendelian Genetics
Sex-Linked Inheritance
- Multiple ChoiceWhich of the following characteristics indicates that a trait is inherited in a sex-linked manner rather than autosomal?
- Multiple ChoiceIn sex-linked inheritance, what genotype must a female have to express the genetic disease hemophilia?
- Open Question
The following pedigree is for the X-linked-recessive trait for color blindness. Using XN for the normal allele and Xn for the color blindness allele, fill in the top half of the boxes/circles with the genotype. Also, fill in the bottom half of the boxes/circles with the phenotype (Normal vision or color blind). If it is impossible to know for certain a specific allele in the genotype, then place a '?' to represent the allele that is in question.
3views - Multiple ChoiceIn werewolves (hypothetically), the pointy ear allele (P) is dominant over the round ear allele (p). The gene for ear shape is on the X chromosome. (Sex determination in werewolves is the same as for "other" humans.) A certain female werewolf has pointy ears even though her father had round ears. What percentage of her sons will have round ears if she mates with a werewolf with round ears?1views
- Multiple ChoiceConsider a woman who is a carrier of a recessive X-linked allele for hemophilia. Which of the following possibilities could explain the presence of the hemophilia allele in her genotype?1views
- Multiple ChoiceWhich of the following results of Thomas Hunt Morgan's experiments with white-eyed mutant flies was unexpected in light of Mendelian genetics?1views
- Multiple Choice
Wild type fruit flies have red eyes. A white-eyed female fly is crossed with a red-eyed male fly. All of the females from the cross are red-eyed and all of the males, white-eyed. What type of inheritance pattern is this?
- Multiple ChoiceA woman is red-green color-blind. What can we conclude, if anything, about her father?1views
- Multiple ChoiceWhat is the probability that a human male will inherit an X-linked recessive allele from his father?1views
- Multiple ChoiceIf a woman is heterozygous for a recessive sex-linked allele and her husband has the dominant allele, which one of the following is true about the probabilities for their children?1views
- Multiple Choice
Women with X-linked disorders always pass the genes for the disorder on to ______. While men with X-linked
disorders always pass the genes for the disorder on to _______.
- Multiple ChoiceDuchenne muscular dystrophy is caused by a sex-linked recessive allele. Its victims are almost invariably boys, who usually die before the age of 20. Why is this disorder almost never seen in girls?1views