Genetics 1 - BICD 100 Practice Problems from Pierce...

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BICD 100 Practice Problems from Pierce Textbook – Weeks 6-8 Chapter 4 22. When Bridges crossed white-eyed females with red-eyed males, he obtained a few red-eyed males and white-eyed females (see Figure 4.13). What types of offspring would be produced if these red-eyed males and white-eyed females were crossed with each other? 32. In chickens, congenital baldness results from a Z-linked recessive gene. A bald rooster is mated with a normal hen. The F1 from this cross are interbred to produce the F2. Give the genotypes and phenotypes, along with their expected proportions, among the F1 and F2 progeny. 35. Red-green color blindness is an X-linked recessive trait in humans. Polydactyly (extra fingers and toes) is an autosomal dominant trait. Martha has normal fingers and toes and normal color vision. Her mother is normal in all respects, but her father is color blind and polydactylous. Bill is color blind and polydactylous. His mother has normal color vision and normal fingers and toes. If Bill and Martha marry, what types and proportions of children can they produce? 40. A color-blind woman and a man with normal vision have three sons and six daughters. All the sons are color blind. Five of the daughters have normal vision, but one of them is color blind. The color-blind daughter is 16 years old, is short for her age, and has never undergone puberty. Propose an explanation for how this girl inherited her color blindness. 44. A geneticist discovers a male mouse in his laboratory colony with greatly enlarged testes. He suspects that this trait results from a new mutation that is either Y-linked or autosomal dominant. How could he determine if the trait is autosomal dominant or Ylinked? Chapter 5 2. What is incomplete penetrance and what causes it? 3. What is gene interaction? What is the difference between an epistatic gene and a hypostatic gene? 4. What is a recessive epistatic gene? 6. What characteristics are exhibited by a cytoplasmically inherited trait? 7. What is genomic imprinting? 8. What is the difference between genetic maternal effect and genomic imprinting? 9. What is the difference between a sex-influenced gene and a gene that exhibits genomic imprinting?
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13. Palomino horses have a golden yellow coat, chestnut horses have a brown coat, and cremello horses have a coat that is almost white. A series of crosses between the three different types of horses produced the following offspring: Cross Off spring palomino x palomino 13 palomino, 6 chestnut, 5 cremello chestnut x chestnut 16 chestnut cremello x cremello 13 cremello palomino x chestnut 8 palomino, 9 chestnut palomino x cremello 11 palomino, 11 cremello chestnut x cremello 23 palomino a. Explain the inheritance of the palomino, chestnut, and cremello phenotypes in horses. b. Assign symbols for the alleles that determine these phenotypes and list the genotypes
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Genetics 1 - BICD 100 Practice Problems from Pierce...

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