BIOL 121 Chapter Notes - Chapter 2: Photic Sneeze Reflex, Y Chromosome

• School: UBC
• Department: Biology
• Course: BIOL 121
• Professor: Maryam Moussavi

Document Summary

For the right pedigree assign genotypes assuming the trait is autosomal recessive. Now try to assign alleles assuming the trait is sex-linked (on the x chromosome) for both dominant and recessive inheritance. All modes of inheritance, except for y-linked, are possible in this case: Achoo could be autosomal recessive, with the affected woman aa, her husband aa, the daughters aa and the son aa. A allele to all his daughters, who would be xaxa as they would also inherited an x with the a allele from their mother: pedigree i: The trait of interest could be y-linked, as every affected man has an affected father, and all sons of affected fathers are affected. Autosomal recessive and x-linked recessive would also work, but these possibilities are much less likely since the trait of interest is rare (again, you should be able to explain/justify this!