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Chapter 4: Problem 11
What characteristics are exhibited by a Y-linked trait?
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Describe the XX-XO system of sex determination. In this system, which is the heterogametic sex and which is the homogametic sex?
A color-blind woman and a man with normal color vision have three sons and six daughters. All the sons are color blind. Five of the daughters have normal color vision, but one of them is color blind. The color-blind daughter is 16 years old, is short for her age, and has not undergone puberty. Explain how this girl inherited her color blindness.
Bob has XXY chromosomes (Klinefelter syndrome) and is color blind. His mother and father have normal color vision, but his maternal grandfather is color blind. Assume that Bob's chromosome abnormality arose from nondisjunction in meiosis. In which parent and in which meiotic division did nondisjunction take place? Assume no crossing over has taken place. Explain your answer.
Coat color in cats is determined by genes at several different loci. At one locus on the X chromosome, one allele \(\left(X^{+}\right)\) encodes black fur; another allele (X") encodes orange fur. Females can be black \(\left(\mathrm{X}^{+} \mathrm{X}^{+}\right)\), orange \(\left(\mathrm{X}^{\circ} \mathrm{X}^{\circ}\right),\) or a mixture of orange and black called tortoiseshell \(\left(\mathrm{X}^{+} \mathrm{X}^{\circ}\right)\) Males are either black \(\left(X^{+} Y\right)\) or orange \(\left(X^{\circ} Y\right) .\) Bill has a female tortoiseshell cat named Patches. One night Patches escapes from Bill's house, spends the night out, and mates with a stray male. Patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. Give the genotypes of Patches, her kittens, and the stray male with which Patches mated.
In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sexreversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this
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