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Questions and Answers
Which sex is more likely to have a recessive, sex-linked trait?
Which parent do sons inherit recessive, sex-linked traits from?
Which type of sex chromosome do you find most sex-linked traits on?
What is the genotype of the man with colorblindness?
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What is the genotype of the woman who is a carrier for colorblindness?
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What is the chance that the child will be colorblind?
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What is the genotype of the male with red eyes in fruit flies?
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What is the genotype of the female with white eyes in fruit flies?
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What is the chance that there will be an offspring with white eyes?
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What is the genotype of the man with hemophilia?
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What is the genotype of the female who is homozygous dominant for the trait?
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Will any of the offspring of a hemophiliac man and a homozygous dominant woman have the disease?
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What is the genotype of the male with barred feathers in chickens?
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What is the genotype of the female with nonbarred feathers?
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What is the probability of having barred females?
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What is the probability of having nonbarred females?
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What is the probability of having barred males?
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What is the probability of having nonbarred males?
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Study Notes
Sex-Linked Traits Overview
- Males are more likely to express recessive, sex-linked traits due to their single X chromosome.
- Sons inherit recessive, sex-linked traits specifically from their mothers, who may be carriers.
X Chromosome and Sex-Linked Traits
- Most sex-linked traits are located on the X chromosome.
- Colorblindness in humans is a common example, caused by a recessive allele (Xn for colorblindness, XN for normal vision).
Colorblindness Example
- A colorblind man (genotype XnY) with a carrier woman (genotype XNXn) has potential offspring combinations.
- Each child has a 50% chance of being colorblind.
- There is a 50% chance of a daughter being a carrier and a 50% chance of a son being colorblind.
Eye Color in Fruit Flies
- Red eyes (XR) are dominant over white eyes (Xr) in fruit flies.
- A red-eyed male (genotype XRY) mating with a white-eyed female (genotype XrXr) can produce offspring.
- Offspring's probability of having white eyes is 50%.
Hemophilia and X-Linked Inheritance
- Hemophilia is caused by a recessive gene on the X chromosome (Xn = affected, XN = not affected).
- A man with hemophilia (genotype XnY) marries a homozygous dominant woman (genotype XNXN).
- None of the offspring will inherit hemophilia as the mother does not carry the recessive allele.
Feather Color in Chickens
- In chickens, barred feathers (ZB) dominate over non-barred feathers (Zb).
- A barred male (genotype ZBW) with a non-barred female (genotype ZbZb) has specific offspring probabilities.
- There is a 0% chance for non-barred males and a 100% chance for barred females.
Summary of Probabilities
- For barred chickens: 100% females will be barred if they inherit ZB from the male.
- Non-barred females and males will have a respective probability of 0% and 100% depending on parental genotypes.
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Description
Explore the fascinating world of sex-linked traits, focusing on how these traits are inherited primarily through X chromosomes. Understand the significance of colorblindness and eye color in both humans and fruit flies, while also examining the implications of being a carrier. This quiz will test your knowledge on these genetic concepts and inheritance patterns.
