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Chapter 13 Chromosomes, Mapping, and the meiosis-Inheritance Connection Read 13.1 What are human female sex chromosomes? X-A What are human male sex chromosomes? • J Which chromosome carries sex-linked (or X-linked) traits? /\ Read 13.2 What are autosomes? 5<s^< t'n mt^ 4 t^ov^e-v-i rvbi $£<*- I'o IccJt If a male and a female both carry a single recessive allele for an X-linked disorder who will express it? /v^ ^ /^ Why? no-thin c A sr\*#lc i{~. Read 13.4 ("Nondisjunction of chromosomes changes chromosome number" only) Cystic fibrosis is a recessive disorder (meaning in order to be affected with cystic fibrosis you must possess 2 recessive alleles). If both parents are heterozygous what percentage of their children would be affected? n<r ^ Cystic fibrosis is a recessive disorder (meaning in order to be affected with cystic fibrosis you must possess 2 recessive alleles). If both parents are homozygous dominant what percentage of their children would be affected? \ y Cystic fibrosis is a recessive disorder (meaning in order to be affected with cystic fibrosis you must possess 2 recessive alleles). If both parents are homozygous recessive what percentage of their childrenwould be affected? / CFQ 7*, Cystic fibrosis is a recessive disorder (meaning in order to be affected with cystic fibrosis you must possess 2 recessive alleles). If one parent is homozygous recessive and one parent is heterozygous what percentage oftheir children would beaffected? ^ y Cystic fibrosis is a recessive disorder (meaning in order to be affected with cystic fibrosis you must possess 2 recessive alleles). If one parent is homozygous dominant and one parent is heterozygous what percentage of their children would be affected? a V Cystic fibrosis is a recessive disorder (meaning in order to be affected with cystic fibrosis you must possess 2 recessive alleles). If one parent is homozygous recessive and one c parent is homozygous dominant what percentage oftheir children would be affected? ®'* What is nondisjunction? (j^r o.-v-a>j fr^4^ &0* 1 4^ J-Q-fi °^ c\ >\ji What phase of the cell cycle fails when nondisjunction occurs? J^ o^f Utv-*-