Chapter 15: The Chromosomal Basis of InheritanceWeek 10, Session 2Supplemental InstructionIowa State UniversityLeader: KelseyCourse: Bio 211 (5)Instructor: Dr. HolscherDate: 10-27-091. What was Thomas Hunt Morgan the first to do?2. A normal character phenotype is referred to as the _______________________. 3. Alternative traits are called _________________ phenotypes.4. On what chromosomes are sex-linked genes found?5. How is the Barr body X chromosome selected?6. Explain why fathers pass sex-linked disorders on only to their daughters, but mothers pass sex-linked disorders on to both their sons and daughters. 7. What happens to genes that are linked? (What do they fail to do?)8. What are recombinant offspring? Supplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.edu9. What causes recombination?10. Calculate the recombination frequency in the following example: In elephants, long trunks (L) are dominant to short trunks (l), and wrinkly skin (W) is dominant to smooth skin (w). An elephant with genotype LlWw is mated with an elephant with genotype llww, and the following offspring are produced: 100 with a long trunk and wrinkly skin, 50 with a short trunk and wrinkly skin, 100 with a short trunk andsmooth skin, and 50 with a short trunk and smooth skin. What is the recombination frequency? 11. The _____________ _______________ (2 words) two genes are, the higher the probability that a ____________________ will occur. 12. What causes nondisjunction of chromosomes?13. Fill in the name of the chromosomal abnormality:- Zygote has an abnormal number of a particular chromosome:_________________- Zygote has only one copy of a particular chromosome:__________________- Zygote has three copies of a particular chromosome: ____________________- Zygote has more than two complete sets of chromosomes:
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