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Lecture 5 Questions - Lecture 5 Study Questions 1 Describe...

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Lecture 5 : Study Questions 1. Describe the XX-XO system of sex determination. In this system, which is the heterogametic sex and which is the homogametic sex? 2. How does sex determination in the XX-XY system differ from sex determination in the ZZ- ZW system? 3. Give the typical sex chromosomes found in the cells of people with Turner syndrome and Klinefelter syndrome. 4. What characteristics are exhibited by an X-linked trait? 5. What are Barr bodies? 6. In certain salamanders, the sex of a genetic female can be altered, making her into a functional male; these salamanders are called sex-reversed males. When a sex-reversed male is mated with a normal female, approximately 2/3 of the offspring are female and 1/3 are male. How is sex determined in these salamanders? Explain the results of this cross. 7. In Drosophila, yellow body is due to an X-linked gene that is recessive to the gene for gray body. a. A homozygous gray female is crossed with a yellow male. The F1 are intercrossed to produce F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and
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